19987690

素因数分解:

$2^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{43}}^2\times {\mathrm{47}}^1$

素因数の和:163

約数の個数: 48

約数和(自身を含む): 39253248

約数和(自身を除く): 19265558

約数列:

[1, 2, 5, 10, 23, 43, 46, 47, 86, 94, 115, 215, 230, 235, 430, 470, 989, 1081, 1849, 1978, 2021, 2162, 3698, 4042, 4945, 5405, 9245, 9890, 10105, 10810, 18490, 20210, 42527, 46483, 85054, 86903, 92966, 173806, 212635, 232415, 425270, 434515, 464830, 869030, 1998769, 3997538, 9993845, 19987690]

約数ペア:

[(1, 19987690), (2, 9993845), (5, 3997538), (10, 1998769), (23, 869030), (43, 464830), (46, 434515), (47, 425270), (86, 232415), (94, 212635), (115, 173806), (215, 92966), (230, 86903), (235, 85054), (430, 46483), (470, 42527), (989, 20210), (1081, 18490), (1849, 10810), (1978, 10105), (2021, 9890), (2162, 9245), (3698, 5405), (4042, 4945)]