21530440

素因数分解:

$2^3\times 5^1\times {\mathrm{211}}^1\times {\mathrm{2551}}^1$

素因数の和:2773

約数の個数: 32

約数和(自身を含む): 48692160

約数和(自身を除く): 27161720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 211, 422, 844, 1055, 1688, 2110, 2551, 4220, 5102, 8440, 10204, 12755, 20408, 25510, 51020, 102040, 538261, 1076522, 2153044, 2691305, 4306088, 5382610, 10765220, 21530440]

約数ペア:

[(1, 21530440), (2, 10765220), (4, 5382610), (5, 4306088), (8, 2691305), (10, 2153044), (20, 1076522), (40, 538261), (211, 102040), (422, 51020), (844, 25510), (1055, 20408), (1688, 12755), (2110, 10204), (2551, 8440), (4220, 5102)]