21797840

素因数分解:

$2^4\times 5^1\times {\mathrm{53}}^2\times {\mathrm{97}}^1$

素因数の和:216

約数の個数: 60

約数和(自身を含む): 52186764

約数和(自身を除く): 30388924

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 53, 80, 97, 106, 194, 212, 265, 388, 424, 485, 530, 776, 848, 970, 1060, 1552, 1940, 2120, 2809, 3880, 4240, 5141, 5618, 7760, 10282, 11236, 14045, 20564, 22472, 25705, 28090, 41128, 44944, 51410, 56180, 82256, 102820, 112360, 205640, 224720, 272473, 411280, 544946, 1089892, 1362365, 2179784, 2724730, 4359568, 5449460, 10898920, 21797840]

約数ペア:

[(1, 21797840), (2, 10898920), (4, 5449460), (5, 4359568), (8, 2724730), (10, 2179784), (16, 1362365), (20, 1089892), (40, 544946), (53, 411280), (80, 272473), (97, 224720), (106, 205640), (194, 112360), (212, 102820), (265, 82256), (388, 56180), (424, 51410), (485, 44944), (530, 41128), (776, 28090), (848, 25705), (970, 22472), (1060, 20564), (1552, 14045), (1940, 11236), (2120, 10282), (2809, 7760), (3880, 5618), (4240, 5141)]