20960920

素因数分解:

$2^3\times 5^1\times {\mathrm{257}}^1\times {\mathrm{2039}}^1$

素因数の和:2307

約数の個数: 32

約数和(自身を含む): 47368800

約数和(自身を除く): 26407880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 257, 514, 1028, 1285, 2039, 2056, 2570, 4078, 5140, 8156, 10195, 10280, 16312, 20390, 40780, 81560, 524023, 1048046, 2096092, 2620115, 4192184, 5240230, 10480460, 20960920]

約数ペア:

[(1, 20960920), (2, 10480460), (4, 5240230), (5, 4192184), (8, 2620115), (10, 2096092), (20, 1048046), (40, 524023), (257, 81560), (514, 40780), (1028, 20390), (1285, 16312), (2039, 10280), (2056, 10195), (2570, 8156), (4078, 5140)]