81708280

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{33487}}^1$

素因数の和:33559

約数の個数: 32

約数和(自身を含む): 186863040

約数和(自身を除く): 105154760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 33487, 66974, 133948, 167435, 267896, 334870, 669740, 1339480, 2042707, 4085414, 8170828, 10213535, 16341656, 20427070, 40854140, 81708280]

約数ペア:

[(1, 81708280), (2, 40854140), (4, 20427070), (5, 16341656), (8, 10213535), (10, 8170828), (20, 4085414), (40, 2042707), (61, 1339480), (122, 669740), (244, 334870), (305, 267896), (488, 167435), (610, 133948), (1220, 66974), (2440, 33487)]