20204840

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{691}}^1$

素因数の和:762

約数の個数: 64

約数和(自身を含む): 49325760

約数和(自身を除く): 29120920

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 43, 68, 85, 86, 136, 170, 172, 215, 340, 344, 430, 680, 691, 731, 860, 1382, 1462, 1720, 2764, 2924, 3455, 3655, 5528, 5848, 6910, 7310, 11747, 13820, 14620, 23494, 27640, 29240, 29713, 46988, 58735, 59426, 93976, 117470, 118852, 148565, 234940, 237704, 297130, 469880, 505121, 594260, 1010242, 1188520, 2020484, 2525605, 4040968, 5051210, 10102420, 20204840]

約数ペア:

[(1, 20204840), (2, 10102420), (4, 5051210), (5, 4040968), (8, 2525605), (10, 2020484), (17, 1188520), (20, 1010242), (34, 594260), (40, 505121), (43, 469880), (68, 297130), (85, 237704), (86, 234940), (136, 148565), (170, 118852), (172, 117470), (215, 93976), (340, 59426), (344, 58735), (430, 46988), (680, 29713), (691, 29240), (731, 27640), (860, 23494), (1382, 14620), (1462, 13820), (1720, 11747), (2764, 7310), (2924, 6910), (3455, 5848), (3655, 5528)]