21071440

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20261}}^1$

素因数の和:20287

約数の個数: 40

約数和(自身を含む): 52762248

約数和(自身を除く): 31690808

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20261, 40522, 81044, 101305, 162088, 202610, 263393, 324176, 405220, 526786, 810440, 1053572, 1316965, 1620880, 2107144, 2633930, 4214288, 5267860, 10535720, 21071440]

約数ペア:

[(1, 21071440), (2, 10535720), (4, 5267860), (5, 4214288), (8, 2633930), (10, 2107144), (13, 1620880), (16, 1316965), (20, 1053572), (26, 810440), (40, 526786), (52, 405220), (65, 324176), (80, 263393), (104, 202610), (130, 162088), (208, 101305), (260, 81044), (520, 40522), (1040, 20261)]