21805245

素因数分解:

$3^2\times 5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1$

素因数の和:96

約数の個数: 144

約数和(自身を含む): 51217920

約数和(自身を除く): 29412675

約数列:

[1, 3, 5, 7, 9, 11, 15, 21, 29, 31, 33, 35, 45, 49, 55, 63, 77, 87, 93, 99, 105, 145, 147, 155, 165, 203, 217, 231, 245, 261, 279, 315, 319, 341, 385, 435, 441, 465, 495, 539, 609, 651, 693, 735, 899, 957, 1015, 1023, 1085, 1155, 1305, 1395, 1421, 1519, 1595, 1617, 1705, 1827, 1953, 2205, 2233, 2387, 2695, 2697, 2871, 3045, 3069, 3255, 3465, 4263, 4495, 4557, 4785, 4851, 5115, 6293, 6699, 7105, 7161, 7595, 8085, 8091, 9135, 9765, 9889, 11165, 11935, 12789, 13485, 13671, 14355, 15345, 15631, 16709, 18879, 20097, 21315, 21483, 22785, 24255, 29667, 31465, 33495, 35805, 40455, 44051, 46893, 49445, 50127, 56637, 63945, 68355, 69223, 78155, 83545, 89001, 94395, 100485, 107415, 132153, 140679, 148335, 150381, 207669, 220255, 234465, 250635, 283185, 346115, 396459, 445005, 484561, 623007, 660765, 703395, 751905, 1038345, 1453683, 1982295, 2422805, 3115035, 4361049, 7268415, 21805245]

約数ペア:

[(1, 21805245), (3, 7268415), (5, 4361049), (7, 3115035), (9, 2422805), (11, 1982295), (15, 1453683), (21, 1038345), (29, 751905), (31, 703395), (33, 660765), (35, 623007), (45, 484561), (49, 445005), (55, 396459), (63, 346115), (77, 283185), (87, 250635), (93, 234465), (99, 220255), (105, 207669), (145, 150381), (147, 148335), (155, 140679), (165, 132153), (203, 107415), (217, 100485), (231, 94395), (245, 89001), (261, 83545), (279, 78155), (315, 69223), (319, 68355), (341, 63945), (385, 56637), (435, 50127), (441, 49445), (465, 46893), (495, 44051), (539, 40455), (609, 35805), (651, 33495), (693, 31465), (735, 29667), (899, 24255), (957, 22785), (1015, 21483), (1023, 21315), (1085, 20097), (1155, 18879), (1305, 16709), (1395, 15631), (1421, 15345), (1519, 14355), (1595, 13671), (1617, 13485), (1705, 12789), (1827, 11935), (1953, 11165), (2205, 9889), (2233, 9765), (2387, 9135), (2695, 8091), (2697, 8085), (2871, 7595), (3045, 7161), (3069, 7105), (3255, 6699), (3465, 6293), (4263, 5115), (4495, 4851), (4557, 4785)]