21418808

素因数分解:

$2^3\times {\mathrm{61}}^1\times {\mathrm{43891}}^1$

素因数の和:43958

約数の個数: 16

約数和(自身を含む): 40819560

約数和(自身を除く): 19400752

約数列:

[1, 2, 4, 8, 61, 122, 244, 488, 43891, 87782, 175564, 351128, 2677351, 5354702, 10709404, 21418808]

約数ペア:

[(1, 21418808), (2, 10709404), (4, 5354702), (8, 2677351), (61, 351128), (122, 175564), (244, 87782), (488, 43891)]