21309880

素因数分解:

$2^3\times 5^1\times {\mathrm{223}}^1\times {\mathrm{2389}}^1$

素因数の和:2623

約数の個数: 32

約数和(自身を含む): 48182400

約数和(自身を除く): 26872520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 223, 446, 892, 1115, 1784, 2230, 2389, 4460, 4778, 8920, 9556, 11945, 19112, 23890, 47780, 95560, 532747, 1065494, 2130988, 2663735, 4261976, 5327470, 10654940, 21309880]

約数ペア:

[(1, 21309880), (2, 10654940), (4, 5327470), (5, 4261976), (8, 2663735), (10, 2130988), (20, 1065494), (40, 532747), (223, 95560), (446, 47780), (892, 23890), (1115, 19112), (1784, 11945), (2230, 9556), (2389, 8920), (4460, 4778)]