20991056

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{229}}^1\times {\mathrm{337}}^1$

素因数の和:591

約数の個数: 40

約数和(自身を含む): 43378920

約数和(自身を除く): 22387864

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 229, 272, 337, 458, 674, 916, 1348, 1832, 2696, 3664, 3893, 5392, 5729, 7786, 11458, 15572, 22916, 31144, 45832, 62288, 77173, 91664, 154346, 308692, 617384, 1234768, 1311941, 2623882, 5247764, 10495528, 20991056]

約数ペア:

[(1, 20991056), (2, 10495528), (4, 5247764), (8, 2623882), (16, 1311941), (17, 1234768), (34, 617384), (68, 308692), (136, 154346), (229, 91664), (272, 77173), (337, 62288), (458, 45832), (674, 31144), (916, 22916), (1348, 15572), (1832, 11458), (2696, 7786), (3664, 5729), (3893, 5392)]