21006760

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12809}}^1$

素因数の和:12861

約数の個数: 32

約数和(自身を含む): 48421800

約数和(自身を除く): 27415040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12809, 25618, 51236, 64045, 102472, 128090, 256180, 512360, 525169, 1050338, 2100676, 2625845, 4201352, 5251690, 10503380, 21006760]

約数ペア:

[(1, 21006760), (2, 10503380), (4, 5251690), (5, 4201352), (8, 2625845), (10, 2100676), (20, 1050338), (40, 525169), (41, 512360), (82, 256180), (164, 128090), (205, 102472), (328, 64045), (410, 51236), (820, 25618), (1640, 12809)]