21209355

素因数分解:

$3^2\times 5^1\times {\mathrm{643}}^1\times {\mathrm{733}}^1$

素因数の和:1387

約数の個数: 24

約数和(自身を含む): 36870288

約数和(自身を除く): 15660933

約数列:

[1, 3, 5, 9, 15, 45, 643, 733, 1929, 2199, 3215, 3665, 5787, 6597, 9645, 10995, 28935, 32985, 471319, 1413957, 2356595, 4241871, 7069785, 21209355]

約数ペア:

[(1, 21209355), (3, 7069785), (5, 4241871), (9, 2356595), (15, 1413957), (45, 471319), (643, 32985), (733, 28935), (1929, 10995), (2199, 9645), (3215, 6597), (3665, 5787)]