21147880

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{607}}^1$

素因数の和:698

約数の個数: 64

約数和(自身を含む): 52093440

約数和(自身を除く): 30945560

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 67, 104, 130, 134, 260, 268, 335, 520, 536, 607, 670, 871, 1214, 1340, 1742, 2428, 2680, 3035, 3484, 4355, 4856, 6070, 6968, 7891, 8710, 12140, 15782, 17420, 24280, 31564, 34840, 39455, 40669, 63128, 78910, 81338, 157820, 162676, 203345, 315640, 325352, 406690, 528697, 813380, 1057394, 1626760, 2114788, 2643485, 4229576, 5286970, 10573940, 21147880]

約数ペア:

[(1, 21147880), (2, 10573940), (4, 5286970), (5, 4229576), (8, 2643485), (10, 2114788), (13, 1626760), (20, 1057394), (26, 813380), (40, 528697), (52, 406690), (65, 325352), (67, 315640), (104, 203345), (130, 162676), (134, 157820), (260, 81338), (268, 78910), (335, 63128), (520, 40669), (536, 39455), (607, 34840), (670, 31564), (871, 24280), (1214, 17420), (1340, 15782), (1742, 12140), (2428, 8710), (2680, 7891), (3035, 6968), (3484, 6070), (4355, 4856)]