20996145

素因数分解:

$3^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{173}}^1$

素因数の和:247

約数の個数: 64

約数和(自身を含む): 40089600

約数和(自身を除く): 19093455

約数列:

[1, 3, 5, 9, 15, 27, 29, 31, 45, 87, 93, 135, 145, 155, 173, 261, 279, 435, 465, 519, 783, 837, 865, 899, 1305, 1395, 1557, 2595, 2697, 3915, 4185, 4495, 4671, 5017, 5363, 7785, 8091, 13485, 15051, 16089, 23355, 24273, 25085, 26815, 40455, 45153, 48267, 75255, 80445, 121365, 135459, 144801, 155527, 225765, 241335, 466581, 677295, 724005, 777635, 1399743, 2332905, 4199229, 6998715, 20996145]

約数ペア:

[(1, 20996145), (3, 6998715), (5, 4199229), (9, 2332905), (15, 1399743), (27, 777635), (29, 724005), (31, 677295), (45, 466581), (87, 241335), (93, 225765), (135, 155527), (145, 144801), (155, 135459), (173, 121365), (261, 80445), (279, 75255), (435, 48267), (465, 45153), (519, 40455), (783, 26815), (837, 25085), (865, 24273), (899, 23355), (1305, 16089), (1395, 15051), (1557, 13485), (2595, 8091), (2697, 7785), (3915, 5363), (4185, 5017), (4495, 4671)]