20015888

素因数分解:

$2^4\times {\mathrm{23}}^1\times {\mathrm{109}}^1\times {\mathrm{499}}^1$

素因数の和:639

約数の個数: 40

約数和(自身を含む): 40920000

約数和(自身を除く): 20904112

約数列:

[1, 2, 4, 8, 16, 23, 46, 92, 109, 184, 218, 368, 436, 499, 872, 998, 1744, 1996, 2507, 3992, 5014, 7984, 10028, 11477, 20056, 22954, 40112, 45908, 54391, 91816, 108782, 183632, 217564, 435128, 870256, 1250993, 2501986, 5003972, 10007944, 20015888]

約数ペア:

[(1, 20015888), (2, 10007944), (4, 5003972), (8, 2501986), (16, 1250993), (23, 870256), (46, 435128), (92, 217564), (109, 183632), (184, 108782), (218, 91816), (368, 54391), (436, 45908), (499, 40112), (872, 22954), (998, 20056), (1744, 11477), (1996, 10028), (2507, 7984), (3992, 5014)]