20405720

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8363}}^1$

素因数の和:8435

約数の個数: 32

約数和(自身を含む): 46671120

約数和(自身を除く): 26265400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8363, 16726, 33452, 41815, 66904, 83630, 167260, 334520, 510143, 1020286, 2040572, 2550715, 4081144, 5101430, 10202860, 20405720]

約数ペア:

[(1, 20405720), (2, 10202860), (4, 5101430), (5, 4081144), (8, 2550715), (10, 2040572), (20, 1020286), (40, 510143), (61, 334520), (122, 167260), (244, 83630), (305, 66904), (488, 41815), (610, 33452), (1220, 16726), (2440, 8363)]