21657040

素因数分解:

$2^4\times 5^1\times {\mathrm{211}}^1\times {\mathrm{1283}}^1$

素因数の和:1507

約数の個数: 40

約数和(自身を含む): 50630688

約数和(自身を除く): 28973648

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 211, 422, 844, 1055, 1283, 1688, 2110, 2566, 3376, 4220, 5132, 6415, 8440, 10264, 12830, 16880, 20528, 25660, 51320, 102640, 270713, 541426, 1082852, 1353565, 2165704, 2707130, 4331408, 5414260, 10828520, 21657040]

約数ペア:

[(1, 21657040), (2, 10828520), (4, 5414260), (5, 4331408), (8, 2707130), (10, 2165704), (16, 1353565), (20, 1082852), (40, 541426), (80, 270713), (211, 102640), (422, 51320), (844, 25660), (1055, 20528), (1283, 16880), (1688, 12830), (2110, 10264), (2566, 8440), (3376, 6415), (4220, 5132)]