20517975

素因数分解:

$3^3\times 5^2\times {\mathrm{113}}^1\times {\mathrm{269}}^1$

素因数の和:401

約数の個数: 48

約数和(自身を含む): 38167200

約数和(自身を除く): 17649225

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 75, 113, 135, 225, 269, 339, 565, 675, 807, 1017, 1345, 1695, 2421, 2825, 3051, 4035, 5085, 6725, 7263, 8475, 12105, 15255, 20175, 25425, 30397, 36315, 60525, 76275, 91191, 151985, 181575, 273573, 455955, 759925, 820719, 1367865, 2279775, 4103595, 6839325, 20517975]

約数ペア:

[(1, 20517975), (3, 6839325), (5, 4103595), (9, 2279775), (15, 1367865), (25, 820719), (27, 759925), (45, 455955), (75, 273573), (113, 181575), (135, 151985), (225, 91191), (269, 76275), (339, 60525), (565, 36315), (675, 30397), (807, 25425), (1017, 20175), (1345, 15255), (1695, 12105), (2421, 8475), (2825, 7263), (3051, 6725), (4035, 5085)]