21285560

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12979}}^1$

素因数の和:13031

約数の個数: 32

約数和(自身を含む): 49064400

約数和(自身を除く): 27778840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12979, 25958, 51916, 64895, 103832, 129790, 259580, 519160, 532139, 1064278, 2128556, 2660695, 4257112, 5321390, 10642780, 21285560]

約数ペア:

[(1, 21285560), (2, 10642780), (4, 5321390), (5, 4257112), (8, 2660695), (10, 2128556), (20, 1064278), (40, 532139), (41, 519160), (82, 259580), (164, 129790), (205, 103832), (328, 64895), (410, 51916), (820, 25958), (1640, 12979)]