399452720

素因数分解:

$2^4\times 5^1\times {\mathrm{4993159}}^1$

素因数の和:4993172

約数の個数: 20

約数和(自身を含む): 928727760

約数和(自身を除く): 529275040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 4993159, 9986318, 19972636, 24965795, 39945272, 49931590, 79890544, 99863180, 199726360, 399452720]

約数ペア:

[(1, 399452720), (2, 199726360), (4, 99863180), (5, 79890544), (8, 49931590), (10, 39945272), (16, 24965795), (20, 19972636), (40, 9986318), (80, 4993159)]