20515120

素因数分解:

$2^4\times 5^1\times {\mathrm{101}}^1\times {\mathrm{2539}}^1$

素因数の和:2653

約数の個数: 40

約数和(自身を含む): 48188880

約数和(自身を除く): 27673760

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 101, 202, 404, 505, 808, 1010, 1616, 2020, 2539, 4040, 5078, 8080, 10156, 12695, 20312, 25390, 40624, 50780, 101560, 203120, 256439, 512878, 1025756, 1282195, 2051512, 2564390, 4103024, 5128780, 10257560, 20515120]

約数ペア:

[(1, 20515120), (2, 10257560), (4, 5128780), (5, 4103024), (8, 2564390), (10, 2051512), (16, 1282195), (20, 1025756), (40, 512878), (80, 256439), (101, 203120), (202, 101560), (404, 50780), (505, 40624), (808, 25390), (1010, 20312), (1616, 12695), (2020, 10156), (2539, 8080), (4040, 5078)]