21285680

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{97}}^1\times {\mathrm{211}}^1$

素因数の和:334

約数の個数: 80

約数和(自身を含む): 54100704

約数和(自身を除く): 32815024

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 97, 104, 130, 194, 208, 211, 260, 388, 422, 485, 520, 776, 844, 970, 1040, 1055, 1261, 1552, 1688, 1940, 2110, 2522, 2743, 3376, 3880, 4220, 5044, 5486, 6305, 7760, 8440, 10088, 10972, 12610, 13715, 16880, 20176, 20467, 21944, 25220, 27430, 40934, 43888, 50440, 54860, 81868, 100880, 102335, 109720, 163736, 204670, 219440, 266071, 327472, 409340, 532142, 818680, 1064284, 1330355, 1637360, 2128568, 2660710, 4257136, 5321420, 10642840, 21285680]

約数ペア:

[(1, 21285680), (2, 10642840), (4, 5321420), (5, 4257136), (8, 2660710), (10, 2128568), (13, 1637360), (16, 1330355), (20, 1064284), (26, 818680), (40, 532142), (52, 409340), (65, 327472), (80, 266071), (97, 219440), (104, 204670), (130, 163736), (194, 109720), (208, 102335), (211, 100880), (260, 81868), (388, 54860), (422, 50440), (485, 43888), (520, 40934), (776, 27430), (844, 25220), (970, 21944), (1040, 20467), (1055, 20176), (1261, 16880), (1552, 13715), (1688, 12610), (1940, 10972), (2110, 10088), (2522, 8440), (2743, 7760), (3376, 6305), (3880, 5486), (4220, 5044)]