18390920

素因数分解:

$2^3\times 5^1\times {\mathrm{257}}^1\times {\mathrm{1789}}^1$

素因数の和:2057

約数の個数: 32

約数和(自身を含む): 41563800

約数和(自身を除く): 23172880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 257, 514, 1028, 1285, 1789, 2056, 2570, 3578, 5140, 7156, 8945, 10280, 14312, 17890, 35780, 71560, 459773, 919546, 1839092, 2298865, 3678184, 4597730, 9195460, 18390920]

約数ペア:

[(1, 18390920), (2, 9195460), (4, 4597730), (5, 3678184), (8, 2298865), (10, 1839092), (20, 919546), (40, 459773), (257, 71560), (514, 35780), (1028, 17890), (1285, 14312), (1789, 10280), (2056, 8945), (2570, 7156), (3578, 5140)]