21551240

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{773}}^1$

素因数の和:842

約数の個数: 64

約数和(自身を含む): 52662960

約数和(自身を除く): 31111720

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 41, 68, 82, 85, 136, 164, 170, 205, 328, 340, 410, 680, 697, 773, 820, 1394, 1546, 1640, 2788, 3092, 3485, 3865, 5576, 6184, 6970, 7730, 13141, 13940, 15460, 26282, 27880, 30920, 31693, 52564, 63386, 65705, 105128, 126772, 131410, 158465, 253544, 262820, 316930, 525640, 538781, 633860, 1077562, 1267720, 2155124, 2693905, 4310248, 5387810, 10775620, 21551240]

約数ペア:

[(1, 21551240), (2, 10775620), (4, 5387810), (5, 4310248), (8, 2693905), (10, 2155124), (17, 1267720), (20, 1077562), (34, 633860), (40, 538781), (41, 525640), (68, 316930), (82, 262820), (85, 253544), (136, 158465), (164, 131410), (170, 126772), (205, 105128), (328, 65705), (340, 63386), (410, 52564), (680, 31693), (697, 30920), (773, 27880), (820, 26282), (1394, 15460), (1546, 13940), (1640, 13141), (2788, 7730), (3092, 6970), (3485, 6184), (3865, 5576)]