21256760

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{89}}^1\times {\mathrm{853}}^1$

素因数の和:960

約数の個数: 64

約数和(自身を含む): 55339200

約数和(自身を除く): 34082440

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 89, 140, 178, 280, 356, 445, 623, 712, 853, 890, 1246, 1706, 1780, 2492, 3115, 3412, 3560, 4265, 4984, 5971, 6230, 6824, 8530, 11942, 12460, 17060, 23884, 24920, 29855, 34120, 47768, 59710, 75917, 119420, 151834, 238840, 303668, 379585, 531419, 607336, 759170, 1062838, 1518340, 2125676, 2657095, 3036680, 4251352, 5314190, 10628380, 21256760]

約数ペア:

[(1, 21256760), (2, 10628380), (4, 5314190), (5, 4251352), (7, 3036680), (8, 2657095), (10, 2125676), (14, 1518340), (20, 1062838), (28, 759170), (35, 607336), (40, 531419), (56, 379585), (70, 303668), (89, 238840), (140, 151834), (178, 119420), (280, 75917), (356, 59710), (445, 47768), (623, 34120), (712, 29855), (853, 24920), (890, 23884), (1246, 17060), (1706, 12460), (1780, 11942), (2492, 8530), (3115, 6824), (3412, 6230), (3560, 5971), (4265, 4984)]