20728640

素因数分解:

$2^6\times 5^1\times {\mathrm{211}}^1\times {\mathrm{307}}^1$

素因数の和:535

約数の個数: 56

約数和(自身を含む): 49755552

約数和(自身を除く): 29026912

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 211, 307, 320, 422, 614, 844, 1055, 1228, 1535, 1688, 2110, 2456, 3070, 3376, 4220, 4912, 6140, 6752, 8440, 9824, 12280, 13504, 16880, 19648, 24560, 33760, 49120, 64777, 67520, 98240, 129554, 259108, 323885, 518216, 647770, 1036432, 1295540, 2072864, 2591080, 4145728, 5182160, 10364320, 20728640]

約数ペア:

[(1, 20728640), (2, 10364320), (4, 5182160), (5, 4145728), (8, 2591080), (10, 2072864), (16, 1295540), (20, 1036432), (32, 647770), (40, 518216), (64, 323885), (80, 259108), (160, 129554), (211, 98240), (307, 67520), (320, 64777), (422, 49120), (614, 33760), (844, 24560), (1055, 19648), (1228, 16880), (1535, 13504), (1688, 12280), (2110, 9824), (2456, 8440), (3070, 6752), (3376, 6140), (4220, 4912)]