21385520

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20563}}^1$

素因数の和:20589

約数の個数: 40

約数和(自身を含む): 53548656

約数和(自身を除く): 32163136

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20563, 41126, 82252, 102815, 164504, 205630, 267319, 329008, 411260, 534638, 822520, 1069276, 1336595, 1645040, 2138552, 2673190, 4277104, 5346380, 10692760, 21385520]

約数ペア:

[(1, 21385520), (2, 10692760), (4, 5346380), (5, 4277104), (8, 2673190), (10, 2138552), (13, 1645040), (16, 1336595), (20, 1069276), (26, 822520), (40, 534638), (52, 411260), (65, 329008), (80, 267319), (104, 205630), (130, 164504), (208, 102815), (260, 82252), (520, 41126), (1040, 20563)]