20494640

素因数分解:

$2^4\times 5^1\times {\mathrm{241}}^1\times {\mathrm{1063}}^1$

素因数の和:1317

約数の個数: 40

約数和(自身を含む): 47892768

約数和(自身を除く): 27398128

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 241, 482, 964, 1063, 1205, 1928, 2126, 2410, 3856, 4252, 4820, 5315, 8504, 9640, 10630, 17008, 19280, 21260, 42520, 85040, 256183, 512366, 1024732, 1280915, 2049464, 2561830, 4098928, 5123660, 10247320, 20494640]

約数ペア:

[(1, 20494640), (2, 10247320), (4, 5123660), (5, 4098928), (8, 2561830), (10, 2049464), (16, 1280915), (20, 1024732), (40, 512366), (80, 256183), (241, 85040), (482, 42520), (964, 21260), (1063, 19280), (1205, 17008), (1928, 10630), (2126, 9640), (2410, 8504), (3856, 5315), (4252, 4820)]