21571420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{163}}^1\times {\mathrm{509}}^1$

素因数の和:694

約数の個数: 48

約数和(自身を含む): 49180320

約数和(自身を除く): 27608900

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 163, 260, 326, 509, 652, 815, 1018, 1630, 2036, 2119, 2545, 3260, 4238, 5090, 6617, 8476, 10180, 10595, 13234, 21190, 26468, 33085, 42380, 66170, 82967, 132340, 165934, 331868, 414835, 829670, 1078571, 1659340, 2157142, 4314284, 5392855, 10785710, 21571420]

約数ペア:

[(1, 21571420), (2, 10785710), (4, 5392855), (5, 4314284), (10, 2157142), (13, 1659340), (20, 1078571), (26, 829670), (52, 414835), (65, 331868), (130, 165934), (163, 132340), (260, 82967), (326, 66170), (509, 42380), (652, 33085), (815, 26468), (1018, 21190), (1630, 13234), (2036, 10595), (2119, 10180), (2545, 8476), (3260, 6617), (4238, 5090)]