21165860

素因数分解:

$2^2\times 5^1\times {\mathrm{449}}^1\times {\mathrm{2357}}^1$

素因数の和:2815

約数の個数: 24

約数和(自身を含む): 44566200

約数和(自身を除く): 23400340

約数列:

[1, 2, 4, 5, 10, 20, 449, 898, 1796, 2245, 2357, 4490, 4714, 8980, 9428, 11785, 23570, 47140, 1058293, 2116586, 4233172, 5291465, 10582930, 21165860]

約数ペア:

[(1, 21165860), (2, 10582930), (4, 5291465), (5, 4233172), (10, 2116586), (20, 1058293), (449, 47140), (898, 23570), (1796, 11785), (2245, 9428), (2357, 8980), (4490, 4714)]