21511779

素因数分解:

$3^1\times {\mathrm{79}}^1\times {\mathrm{139}}^1\times {\mathrm{653}}^1$

素因数の和:874

約数の個数: 16

約数和(自身を含む): 29299200

約数和(自身を除く): 7787421

約数列:

[1, 3, 79, 139, 237, 417, 653, 1959, 10981, 32943, 51587, 90767, 154761, 272301, 7170593, 21511779]

約数ペア:

[(1, 21511779), (3, 7170593), (79, 272301), (139, 154761), (237, 90767), (417, 51587), (653, 32943), (1959, 10981)]