21580840

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12547}}^1$

素因数の和:12601

約数の個数: 32

約数和(自身を含む): 49690080

約数和(自身を除く): 28109240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12547, 25094, 50188, 62735, 100376, 125470, 250940, 501880, 539521, 1079042, 2158084, 2697605, 4316168, 5395210, 10790420, 21580840]

約数ペア:

[(1, 21580840), (2, 10790420), (4, 5395210), (5, 4316168), (8, 2697605), (10, 2158084), (20, 1079042), (40, 539521), (43, 501880), (86, 250940), (172, 125470), (215, 100376), (344, 62735), (430, 50188), (860, 25094), (1720, 12547)]