21402760

素因数分解:

$2^3\times 5^1\times {\mathrm{647}}^1\times {\mathrm{827}}^1$

素因数の和:1485

約数の個数: 32

約数和(自身を含む): 48288960

約数和(自身を除く): 26886200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 647, 827, 1294, 1654, 2588, 3235, 3308, 4135, 5176, 6470, 6616, 8270, 12940, 16540, 25880, 33080, 535069, 1070138, 2140276, 2675345, 4280552, 5350690, 10701380, 21402760]

約数ペア:

[(1, 21402760), (2, 10701380), (4, 5350690), (5, 4280552), (8, 2675345), (10, 2140276), (20, 1070138), (40, 535069), (647, 33080), (827, 25880), (1294, 16540), (1654, 12940), (2588, 8270), (3235, 6616), (3308, 6470), (4135, 5176)]