30981880

素因数分解:

$2^3\times 5^1\times {\mathrm{397}}^1\times {\mathrm{1951}}^1$

素因数の和:2359

約数の個数: 32

約数和(自身を含む): 69920640

約数和(自身を除く): 38938760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 397, 794, 1588, 1951, 1985, 3176, 3902, 3970, 7804, 7940, 9755, 15608, 15880, 19510, 39020, 78040, 774547, 1549094, 3098188, 3872735, 6196376, 7745470, 15490940, 30981880]

約数ペア:

[(1, 30981880), (2, 15490940), (4, 7745470), (5, 6196376), (8, 3872735), (10, 3098188), (20, 1549094), (40, 774547), (397, 78040), (794, 39020), (1588, 19510), (1951, 15880), (1985, 15608), (3176, 9755), (3902, 7940), (3970, 7804)]