18986420

素因数分解:

$2^2\times 5^1\times {\mathrm{641}}^1\times {\mathrm{1481}}^1$

素因数の和:2131

約数の個数: 24

約数和(自身を含む): 39960648

約数和(自身を除く): 20974228

約数列:

[1, 2, 4, 5, 10, 20, 641, 1282, 1481, 2564, 2962, 3205, 5924, 6410, 7405, 12820, 14810, 29620, 949321, 1898642, 3797284, 4746605, 9493210, 18986420]

約数ペア:

[(1, 18986420), (2, 9493210), (4, 4746605), (5, 3797284), (10, 1898642), (20, 949321), (641, 29620), (1282, 14810), (1481, 12820), (2564, 7405), (2962, 6410), (3205, 5924)]