21306920

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{17183}}^1$

素因数の和:17225

約数の個数: 32

約数和(自身を含む): 49489920

約数和(自身を除く): 28183000

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 17183, 34366, 68732, 85915, 137464, 171830, 343660, 532673, 687320, 1065346, 2130692, 2663365, 4261384, 5326730, 10653460, 21306920]

約数ペア:

[(1, 21306920), (2, 10653460), (4, 5326730), (5, 4261384), (8, 2663365), (10, 2130692), (20, 1065346), (31, 687320), (40, 532673), (62, 343660), (124, 171830), (155, 137464), (248, 85915), (310, 68732), (620, 34366), (1240, 17183)]