21649580

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{9931}}^1$

素因数の和:10049

約数の個数: 24

約数和(自身を含む): 45885840

約数和(自身を除く): 24236260

約数列:

[1, 2, 4, 5, 10, 20, 109, 218, 436, 545, 1090, 2180, 9931, 19862, 39724, 49655, 99310, 198620, 1082479, 2164958, 4329916, 5412395, 10824790, 21649580]

約数ペア:

[(1, 21649580), (2, 10824790), (4, 5412395), (5, 4329916), (10, 2164958), (20, 1082479), (109, 198620), (218, 99310), (436, 49655), (545, 39724), (1090, 19862), (2180, 9931)]