21850815

素因数分解:

$3^1\times 5^1\times 7^3\times {\mathrm{31}}^1\times {\mathrm{137}}^1$

素因数の和:197

約数の個数: 64

約数和(自身を含む): 42393600

約数和(自身を除く): 20542785

約数列:

[1, 3, 5, 7, 15, 21, 31, 35, 49, 93, 105, 137, 147, 155, 217, 245, 343, 411, 465, 651, 685, 735, 959, 1029, 1085, 1519, 1715, 2055, 2877, 3255, 4247, 4557, 4795, 5145, 6713, 7595, 10633, 12741, 14385, 20139, 21235, 22785, 29729, 31899, 33565, 46991, 53165, 63705, 89187, 100695, 140973, 148645, 159495, 208103, 234955, 445935, 624309, 704865, 1040515, 1456721, 3121545, 4370163, 7283605, 21850815]

約数ペア:

[(1, 21850815), (3, 7283605), (5, 4370163), (7, 3121545), (15, 1456721), (21, 1040515), (31, 704865), (35, 624309), (49, 445935), (93, 234955), (105, 208103), (137, 159495), (147, 148645), (155, 140973), (217, 100695), (245, 89187), (343, 63705), (411, 53165), (465, 46991), (651, 33565), (685, 31899), (735, 29729), (959, 22785), (1029, 21235), (1085, 20139), (1519, 14385), (1715, 12741), (2055, 10633), (2877, 7595), (3255, 6713), (4247, 5145), (4557, 4795)]