20987955

素因数分解:

$3^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{6569}}^1$

素因数の和:6651

約数の個数: 24

約数和(自身を含む): 36897120

約数和(自身を除く): 15909165

約数列:

[1, 3, 5, 9, 15, 45, 71, 213, 355, 639, 1065, 3195, 6569, 19707, 32845, 59121, 98535, 295605, 466399, 1399197, 2331995, 4197591, 6995985, 20987955]

約数ペア:

[(1, 20987955), (3, 6995985), (5, 4197591), (9, 2331995), (15, 1399197), (45, 466399), (71, 295605), (213, 98535), (355, 59121), (639, 32845), (1065, 19707), (3195, 6569)]