21221840

素因数分解:

$2^4\times 5^1\times {\mathrm{265273}}^1$

素因数の和:265286

約数の個数: 20

約数和(自身を含む): 49340964

約数和(自身を除く): 28119124

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265273, 530546, 1061092, 1326365, 2122184, 2652730, 4244368, 5305460, 10610920, 21221840]

約数ペア:

[(1, 21221840), (2, 10610920), (4, 5305460), (5, 4244368), (8, 2652730), (10, 2122184), (16, 1326365), (20, 1061092), (40, 530546), (80, 265273)]