18120400

素因数分解:

$2^4\times 5^2\times {\mathrm{89}}^1\times {\mathrm{509}}^1$

素因数の和:616

約数の個数: 60

約数和(自身を含む): 44109900

約数和(自身を除く): 25989500

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 89, 100, 178, 200, 356, 400, 445, 509, 712, 890, 1018, 1424, 1780, 2036, 2225, 2545, 3560, 4072, 4450, 5090, 7120, 8144, 8900, 10180, 12725, 17800, 20360, 25450, 35600, 40720, 45301, 50900, 90602, 101800, 181204, 203600, 226505, 362408, 453010, 724816, 906020, 1132525, 1812040, 2265050, 3624080, 4530100, 9060200, 18120400]

約数ペア:

[(1, 18120400), (2, 9060200), (4, 4530100), (5, 3624080), (8, 2265050), (10, 1812040), (16, 1132525), (20, 906020), (25, 724816), (40, 453010), (50, 362408), (80, 226505), (89, 203600), (100, 181204), (178, 101800), (200, 90602), (356, 50900), (400, 45301), (445, 40720), (509, 35600), (712, 25450), (890, 20360), (1018, 17800), (1424, 12725), (1780, 10180), (2036, 8900), (2225, 8144), (2545, 7120), (3560, 5090), (4072, 4450)]