20919915

素因数分解:

$3^2\times 5^1\times {\mathrm{397}}^1\times {\mathrm{1171}}^1$

素因数の和:1579

約数の個数: 24

約数和(自身を含む): 36383568

約数和(自身を除く): 15463653

約数列:

[1, 3, 5, 9, 15, 45, 397, 1171, 1191, 1985, 3513, 3573, 5855, 5955, 10539, 17565, 17865, 52695, 464887, 1394661, 2324435, 4183983, 6973305, 20919915]

約数ペア:

[(1, 20919915), (3, 6973305), (5, 4183983), (9, 2324435), (15, 1394661), (45, 464887), (397, 52695), (1171, 17865), (1191, 17565), (1985, 10539), (3513, 5955), (3573, 5855)]