21021800

素因数分解:

$2^3\times 5^2\times {\mathrm{89}}^1\times {\mathrm{1181}}^1$

素因数の和:1286

約数の個数: 48

約数和(自身を含む): 49466700

約数和(自身を除く): 28444900

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 89, 100, 178, 200, 356, 445, 712, 890, 1181, 1780, 2225, 2362, 3560, 4450, 4724, 5905, 8900, 9448, 11810, 17800, 23620, 29525, 47240, 59050, 105109, 118100, 210218, 236200, 420436, 525545, 840872, 1051090, 2102180, 2627725, 4204360, 5255450, 10510900, 21021800]

約数ペア:

[(1, 21021800), (2, 10510900), (4, 5255450), (5, 4204360), (8, 2627725), (10, 2102180), (20, 1051090), (25, 840872), (40, 525545), (50, 420436), (89, 236200), (100, 210218), (178, 118100), (200, 105109), (356, 59050), (445, 47240), (712, 29525), (890, 23620), (1181, 17800), (1780, 11810), (2225, 9448), (2362, 8900), (3560, 5905), (4450, 4724)]