20013880

素因数分解:

$2^3\times 5^1\times {\mathrm{509}}^1\times {\mathrm{983}}^1$

素因数の和:1503

約数の個数: 32

約数和(自身を含む): 45165600

約数和(自身を除く): 25151720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 509, 983, 1018, 1966, 2036, 2545, 3932, 4072, 4915, 5090, 7864, 9830, 10180, 19660, 20360, 39320, 500347, 1000694, 2001388, 2501735, 4002776, 5003470, 10006940, 20013880]

約数ペア:

[(1, 20013880), (2, 10006940), (4, 5003470), (5, 4002776), (8, 2501735), (10, 2001388), (20, 1000694), (40, 500347), (509, 39320), (983, 20360), (1018, 19660), (1966, 10180), (2036, 9830), (2545, 7864), (3932, 5090), (4072, 4915)]