21260720

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20443}}^1$

素因数の和:20469

約数の個数: 40

約数和(自身を含む): 53236176

約数和(自身を除く): 31975456

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20443, 40886, 81772, 102215, 163544, 204430, 265759, 327088, 408860, 531518, 817720, 1063036, 1328795, 1635440, 2126072, 2657590, 4252144, 5315180, 10630360, 21260720]

約数ペア:

[(1, 21260720), (2, 10630360), (4, 5315180), (5, 4252144), (8, 2657590), (10, 2126072), (13, 1635440), (16, 1328795), (20, 1063036), (26, 817720), (40, 531518), (52, 408860), (65, 327088), (80, 265759), (104, 204430), (130, 163544), (208, 102215), (260, 81772), (520, 40886), (1040, 20443)]