81377720

素因数分解:

$2^3\times 5^1\times {\mathrm{101}}^1\times {\mathrm{20143}}^1$

素因数の和:20255

約数の個数: 32

約数和(自身を含む): 184921920

約数和(自身を除く): 103544200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 101, 202, 404, 505, 808, 1010, 2020, 4040, 20143, 40286, 80572, 100715, 161144, 201430, 402860, 805720, 2034443, 4068886, 8137772, 10172215, 16275544, 20344430, 40688860, 81377720]

約数ペア:

[(1, 81377720), (2, 40688860), (4, 20344430), (5, 16275544), (8, 10172215), (10, 8137772), (20, 4068886), (40, 2034443), (101, 805720), (202, 402860), (404, 201430), (505, 161144), (808, 100715), (1010, 80572), (2020, 40286), (4040, 20143)]