20855440

素因数分解:

$2^4\times 5^1\times {\mathrm{103}}^1\times {\mathrm{2531}}^1$

素因数の和:2647

約数の個数: 40

約数和(自身を含む): 48979008

約数和(自身を除く): 28123568

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 103, 206, 412, 515, 824, 1030, 1648, 2060, 2531, 4120, 5062, 8240, 10124, 12655, 20248, 25310, 40496, 50620, 101240, 202480, 260693, 521386, 1042772, 1303465, 2085544, 2606930, 4171088, 5213860, 10427720, 20855440]

約数ペア:

[(1, 20855440), (2, 10427720), (4, 5213860), (5, 4171088), (8, 2606930), (10, 2085544), (16, 1303465), (20, 1042772), (40, 521386), (80, 260693), (103, 202480), (206, 101240), (412, 50620), (515, 40496), (824, 25310), (1030, 20248), (1648, 12655), (2060, 10124), (2531, 8240), (4120, 5062)]