21986781

素因数分解:

$3^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{541}}^1$

素因数の和:617

約数の個数: 32

約数和(自身を含む): 33300480

約数和(自身を除く): 11313699

約数列:

[1, 3, 19, 23, 31, 57, 69, 93, 437, 541, 589, 713, 1311, 1623, 1767, 2139, 10279, 12443, 13547, 16771, 30837, 37329, 40641, 50313, 236417, 318649, 385733, 709251, 955947, 1157199, 7328927, 21986781]

約数ペア:

[(1, 21986781), (3, 7328927), (19, 1157199), (23, 955947), (31, 709251), (57, 385733), (69, 318649), (93, 236417), (437, 50313), (541, 40641), (589, 37329), (713, 30837), (1311, 16771), (1623, 13547), (1767, 12443), (2139, 10279)]