21203780

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81553}}^1$

素因数の和:81575

約数の個数: 24

約数和(自身を含む): 47953752

約数和(自身を除く): 26749972

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81553, 163106, 326212, 407765, 815530, 1060189, 1631060, 2120378, 4240756, 5300945, 10601890, 21203780]

約数ペア:

[(1, 21203780), (2, 10601890), (4, 5300945), (5, 4240756), (10, 2120378), (13, 1631060), (20, 1060189), (26, 815530), (52, 407765), (65, 326212), (130, 163106), (260, 81553)]