21143860

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{67}}^1\times {\mathrm{509}}^1$

素因数の和:616

約数の個数: 48

約数和(自身を含む): 46609920

約数和(自身を除く): 25466060

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 67, 124, 134, 155, 268, 310, 335, 509, 620, 670, 1018, 1340, 2036, 2077, 2545, 4154, 5090, 8308, 10180, 10385, 15779, 20770, 31558, 34103, 41540, 63116, 68206, 78895, 136412, 157790, 170515, 315580, 341030, 682060, 1057193, 2114386, 4228772, 5285965, 10571930, 21143860]

約数ペア:

[(1, 21143860), (2, 10571930), (4, 5285965), (5, 4228772), (10, 2114386), (20, 1057193), (31, 682060), (62, 341030), (67, 315580), (124, 170515), (134, 157790), (155, 136412), (268, 78895), (310, 68206), (335, 63116), (509, 41540), (620, 34103), (670, 31558), (1018, 20770), (1340, 15779), (2036, 10385), (2077, 10180), (2545, 8308), (4154, 5090)]