20638839

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{397}}^1$

素因数の和:487

約数の個数: 32

約数和(自身を含む): 31381504

約数和(自身を除く): 10742665

約数列:

[1, 3, 13, 31, 39, 43, 93, 129, 397, 403, 559, 1191, 1209, 1333, 1677, 3999, 5161, 12307, 15483, 17071, 17329, 36921, 51213, 51987, 159991, 221923, 479973, 529201, 665769, 1587603, 6879613, 20638839]

約数ペア:

[(1, 20638839), (3, 6879613), (13, 1587603), (31, 665769), (39, 529201), (43, 479973), (93, 221923), (129, 159991), (397, 51987), (403, 51213), (559, 36921), (1191, 17329), (1209, 17071), (1333, 15483), (1677, 12307), (3999, 5161)]