20451620

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{41}}^1\times {\mathrm{509}}^1$

素因数の和:573

約数の個数: 72

約数和(自身を含む): 51279480

約数和(自身を除く): 30827860

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 41, 49, 70, 82, 98, 140, 164, 196, 205, 245, 287, 410, 490, 509, 574, 820, 980, 1018, 1148, 1435, 2009, 2036, 2545, 2870, 3563, 4018, 5090, 5740, 7126, 8036, 10045, 10180, 14252, 17815, 20090, 20869, 24941, 35630, 40180, 41738, 49882, 71260, 83476, 99764, 104345, 124705, 146083, 208690, 249410, 292166, 417380, 498820, 584332, 730415, 1022581, 1460830, 2045162, 2921660, 4090324, 5112905, 10225810, 20451620]

約数ペア:

[(1, 20451620), (2, 10225810), (4, 5112905), (5, 4090324), (7, 2921660), (10, 2045162), (14, 1460830), (20, 1022581), (28, 730415), (35, 584332), (41, 498820), (49, 417380), (70, 292166), (82, 249410), (98, 208690), (140, 146083), (164, 124705), (196, 104345), (205, 99764), (245, 83476), (287, 71260), (410, 49882), (490, 41738), (509, 40180), (574, 35630), (820, 24941), (980, 20869), (1018, 20090), (1148, 17815), (1435, 14252), (2009, 10180), (2036, 10045), (2545, 8036), (2870, 7126), (3563, 5740), (4018, 5090)]