21277240

素因数分解:

$2^3\times 5^1\times {\mathrm{211}}^1\times {\mathrm{2521}}^1$

素因数の和:2743

約数の個数: 32

約数和(自身を含む): 48119760

約数和(自身を除く): 26842520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 211, 422, 844, 1055, 1688, 2110, 2521, 4220, 5042, 8440, 10084, 12605, 20168, 25210, 50420, 100840, 531931, 1063862, 2127724, 2659655, 4255448, 5319310, 10638620, 21277240]

約数ペア:

[(1, 21277240), (2, 10638620), (4, 5319310), (5, 4255448), (8, 2659655), (10, 2127724), (20, 1063862), (40, 531931), (211, 100840), (422, 50420), (844, 25210), (1055, 20168), (1688, 12605), (2110, 10084), (2521, 8440), (4220, 5042)]