21764840

素因数分解:

$2^3\times 5^1\times {\mathrm{509}}^1\times {\mathrm{1069}}^1$

素因数の和:1589

約数の個数: 32

約数和(自身を含む): 49113000

約数和(自身を除く): 27348160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 509, 1018, 1069, 2036, 2138, 2545, 4072, 4276, 5090, 5345, 8552, 10180, 10690, 20360, 21380, 42760, 544121, 1088242, 2176484, 2720605, 4352968, 5441210, 10882420, 21764840]

約数ペア:

[(1, 21764840), (2, 10882420), (4, 5441210), (5, 4352968), (8, 2720605), (10, 2176484), (20, 1088242), (40, 544121), (509, 42760), (1018, 21380), (1069, 20360), (2036, 10690), (2138, 10180), (2545, 8552), (4072, 5345), (4276, 5090)]