19958620

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{257}}^1\times {\mathrm{353}}^1$

素因数の和:630

約数の個数: 48

約数和(自身を含む): 46031328

約数和(自身を除く): 26072708

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 257, 353, 514, 706, 1028, 1285, 1412, 1765, 2570, 2827, 3530, 3883, 5140, 5654, 7060, 7766, 11308, 14135, 15532, 19415, 28270, 38830, 56540, 77660, 90721, 181442, 362884, 453605, 907210, 997931, 1814420, 1995862, 3991724, 4989655, 9979310, 19958620]

約数ペア:

[(1, 19958620), (2, 9979310), (4, 4989655), (5, 3991724), (10, 1995862), (11, 1814420), (20, 997931), (22, 907210), (44, 453605), (55, 362884), (110, 181442), (220, 90721), (257, 77660), (353, 56540), (514, 38830), (706, 28270), (1028, 19415), (1285, 15532), (1412, 14135), (1765, 11308), (2570, 7766), (2827, 7060), (3530, 5654), (3883, 5140)]