20918768

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{163}}^1\times {\mathrm{617}}^1$

素因数の和:801

約数の個数: 40

約数和(自身を含む): 43986768

約数和(自身を除く): 23068000

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 163, 208, 326, 617, 652, 1234, 1304, 2119, 2468, 2608, 4238, 4936, 8021, 8476, 9872, 16042, 16952, 32084, 33904, 64168, 100571, 128336, 201142, 402284, 804568, 1307423, 1609136, 2614846, 5229692, 10459384, 20918768]

約数ペア:

[(1, 20918768), (2, 10459384), (4, 5229692), (8, 2614846), (13, 1609136), (16, 1307423), (26, 804568), (52, 402284), (104, 201142), (163, 128336), (208, 100571), (326, 64168), (617, 33904), (652, 32084), (1234, 16952), (1304, 16042), (2119, 9872), (2468, 8476), (2608, 8021), (4238, 4936)]