20209040

素因数分解:

$2^4\times 5^1\times {\mathrm{157}}^1\times {\mathrm{1609}}^1$

素因数の和:1779

約数の個数: 40

約数和(自身を含む): 47314680

約数和(自身を除く): 27105640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 157, 314, 628, 785, 1256, 1570, 1609, 2512, 3140, 3218, 6280, 6436, 8045, 12560, 12872, 16090, 25744, 32180, 64360, 128720, 252613, 505226, 1010452, 1263065, 2020904, 2526130, 4041808, 5052260, 10104520, 20209040]

約数ペア:

[(1, 20209040), (2, 10104520), (4, 5052260), (5, 4041808), (8, 2526130), (10, 2020904), (16, 1263065), (20, 1010452), (40, 505226), (80, 252613), (157, 128720), (314, 64360), (628, 32180), (785, 25744), (1256, 16090), (1570, 12872), (1609, 12560), (2512, 8045), (3140, 6436), (3218, 6280)]