21920355

素因数分解:

$3^3\times 5^1\times {\mathrm{397}}^1\times {\mathrm{409}}^1$

素因数の和:820

約数の個数: 32

約数和(自身を含む): 39163200

約数和(自身を除く): 17242845

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 397, 409, 1191, 1227, 1985, 2045, 3573, 3681, 5955, 6135, 10719, 11043, 17865, 18405, 53595, 55215, 162373, 487119, 811865, 1461357, 2435595, 4384071, 7306785, 21920355]

約数ペア:

[(1, 21920355), (3, 7306785), (5, 4384071), (9, 2435595), (15, 1461357), (27, 811865), (45, 487119), (135, 162373), (397, 55215), (409, 53595), (1191, 18405), (1227, 17865), (1985, 11043), (2045, 10719), (3573, 6135), (3681, 5955)]