21221560

素因数分解:

$2^3\times 5^1\times {\mathrm{530539}}^1$

素因数の和:530550

約数の個数: 16

約数和(自身を含む): 47748600

約数和(自身を除く): 26527040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 530539, 1061078, 2122156, 2652695, 4244312, 5305390, 10610780, 21221560]

約数ペア:

[(1, 21221560), (2, 10610780), (4, 5305390), (5, 4244312), (8, 2652695), (10, 2122156), (20, 1061078), (40, 530539)]