20866960

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{2393}}^1$

素因数の和:2515

約数の個数: 40

約数和(自身を含む): 48981240

約数和(自身を除く): 28114280

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2180, 2393, 4360, 4786, 8720, 9572, 11965, 19144, 23930, 38288, 47860, 95720, 191440, 260837, 521674, 1043348, 1304185, 2086696, 2608370, 4173392, 5216740, 10433480, 20866960]

約数ペア:

[(1, 20866960), (2, 10433480), (4, 5216740), (5, 4173392), (8, 2608370), (10, 2086696), (16, 1304185), (20, 1043348), (40, 521674), (80, 260837), (109, 191440), (218, 95720), (436, 47860), (545, 38288), (872, 23930), (1090, 19144), (1744, 11965), (2180, 9572), (2393, 8720), (4360, 4786)]