21263920

素因数分解:

$2^4\times 5^1\times {\mathrm{131}}^1\times {\mathrm{2029}}^1$

素因数の和:2173

約数の個数: 40

約数和(自身を含む): 49840560

約数和(自身を除く): 28576640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 131, 262, 524, 655, 1048, 1310, 2029, 2096, 2620, 4058, 5240, 8116, 10145, 10480, 16232, 20290, 32464, 40580, 81160, 162320, 265799, 531598, 1063196, 1328995, 2126392, 2657990, 4252784, 5315980, 10631960, 21263920]

約数ペア:

[(1, 21263920), (2, 10631960), (4, 5315980), (5, 4252784), (8, 2657990), (10, 2126392), (16, 1328995), (20, 1063196), (40, 531598), (80, 265799), (131, 162320), (262, 81160), (524, 40580), (655, 32464), (1048, 20290), (1310, 16232), (2029, 10480), (2096, 10145), (2620, 8116), (4058, 5240)]