20891890

素因数分解:

$2^1\times 5^1\times {\mathrm{29}}^1\times {\mathrm{61}}^1\times {\mathrm{1181}}^1$

素因数の和:1278

約数の個数: 32

約数和(自身を含む): 39573360

約数和(自身を除く): 18681470

約数列:

[1, 2, 5, 10, 29, 58, 61, 122, 145, 290, 305, 610, 1181, 1769, 2362, 3538, 5905, 8845, 11810, 17690, 34249, 68498, 72041, 144082, 171245, 342490, 360205, 720410, 2089189, 4178378, 10445945, 20891890]

約数ペア:

[(1, 20891890), (2, 10445945), (5, 4178378), (10, 2089189), (29, 720410), (58, 360205), (61, 342490), (122, 171245), (145, 144082), (290, 72041), (305, 68498), (610, 34249), (1181, 17690), (1769, 11810), (2362, 8845), (3538, 5905)]