21361640

素因数分解:

$2^3\times 5^1\times {\mathrm{211}}^1\times {\mathrm{2531}}^1$

素因数の和:2753

約数の個数: 32

約数和(自身を含む): 48310560

約数和(自身を除く): 26948920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 211, 422, 844, 1055, 1688, 2110, 2531, 4220, 5062, 8440, 10124, 12655, 20248, 25310, 50620, 101240, 534041, 1068082, 2136164, 2670205, 4272328, 5340410, 10680820, 21361640]

約数ペア:

[(1, 21361640), (2, 10680820), (4, 5340410), (5, 4272328), (8, 2670205), (10, 2136164), (20, 1068082), (40, 534041), (211, 101240), (422, 50620), (844, 25310), (1055, 20248), (1688, 12655), (2110, 10124), (2531, 8440), (4220, 5062)]