20978020

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{5167}}^1$

素因数の和:5212

約数の個数: 48

約数和(自身を含む): 52093440

約数和(自身を除く): 31115420

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 29, 35, 58, 70, 116, 140, 145, 203, 290, 406, 580, 812, 1015, 2030, 4060, 5167, 10334, 20668, 25835, 36169, 51670, 72338, 103340, 144676, 149843, 180845, 299686, 361690, 599372, 723380, 749215, 1048901, 1498430, 2097802, 2996860, 4195604, 5244505, 10489010, 20978020]

約数ペア:

[(1, 20978020), (2, 10489010), (4, 5244505), (5, 4195604), (7, 2996860), (10, 2097802), (14, 1498430), (20, 1048901), (28, 749215), (29, 723380), (35, 599372), (58, 361690), (70, 299686), (116, 180845), (140, 149843), (145, 144676), (203, 103340), (290, 72338), (406, 51670), (580, 36169), (812, 25835), (1015, 20668), (2030, 10334), (4060, 5167)]