21252680

素因数分解:

$2^3\times 5^1\times {\mathrm{487}}^1\times {\mathrm{1091}}^1$

素因数の和:1589

約数の個数: 32

約数和(自身を含む): 47960640

約数和(自身を除く): 26707960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 487, 974, 1091, 1948, 2182, 2435, 3896, 4364, 4870, 5455, 8728, 9740, 10910, 19480, 21820, 43640, 531317, 1062634, 2125268, 2656585, 4250536, 5313170, 10626340, 21252680]

約数ペア:

[(1, 21252680), (2, 10626340), (4, 5313170), (5, 4250536), (8, 2656585), (10, 2125268), (20, 1062634), (40, 531317), (487, 43640), (974, 21820), (1091, 19480), (1948, 10910), (2182, 9740), (2435, 8728), (3896, 5455), (4364, 4870)]