21392015

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{1747}}^1$

素因数の和:1862

約数の個数: 16

約数和(自身を含む): 26849280

約数和(自身を除く): 5457265

約数列:

[1, 5, 31, 79, 155, 395, 1747, 2449, 8735, 12245, 54157, 138013, 270785, 690065, 4278403, 21392015]

約数ペア:

[(1, 21392015), (5, 4278403), (31, 690065), (79, 270785), (155, 138013), (395, 54157), (1747, 12245), (2449, 8735)]