20655440

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19861}}^1$

素因数の和:19887

約数の個数: 40

約数和(自身を含む): 51720648

約数和(自身を除く): 31065208

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19861, 39722, 79444, 99305, 158888, 198610, 258193, 317776, 397220, 516386, 794440, 1032772, 1290965, 1588880, 2065544, 2581930, 4131088, 5163860, 10327720, 20655440]

約数ペア:

[(1, 20655440), (2, 10327720), (4, 5163860), (5, 4131088), (8, 2581930), (10, 2065544), (13, 1588880), (16, 1290965), (20, 1032772), (26, 794440), (40, 516386), (52, 397220), (65, 317776), (80, 258193), (104, 198610), (130, 158888), (208, 99305), (260, 79444), (520, 39722), (1040, 19861)]