21356920

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{613}}^1$

素因数の和:704

約数の個数: 64

約数和(自身を含む): 52607520

約数和(自身を除く): 31250600

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 67, 104, 130, 134, 260, 268, 335, 520, 536, 613, 670, 871, 1226, 1340, 1742, 2452, 2680, 3065, 3484, 4355, 4904, 6130, 6968, 7969, 8710, 12260, 15938, 17420, 24520, 31876, 34840, 39845, 41071, 63752, 79690, 82142, 159380, 164284, 205355, 318760, 328568, 410710, 533923, 821420, 1067846, 1642840, 2135692, 2669615, 4271384, 5339230, 10678460, 21356920]

約数ペア:

[(1, 21356920), (2, 10678460), (4, 5339230), (5, 4271384), (8, 2669615), (10, 2135692), (13, 1642840), (20, 1067846), (26, 821420), (40, 533923), (52, 410710), (65, 328568), (67, 318760), (104, 205355), (130, 164284), (134, 159380), (260, 82142), (268, 79690), (335, 63752), (520, 41071), (536, 39845), (613, 34840), (670, 31876), (871, 24520), (1226, 17420), (1340, 15938), (1742, 12260), (2452, 8710), (2680, 7969), (3065, 6968), (3484, 6130), (4355, 4904)]