18911240

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{101}}^1\times {\mathrm{151}}^1$

素因数の和:294

約数の個数: 64

約数和(自身を含む): 44651520

約数和(自身を除く): 25740280

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 101, 124, 151, 155, 202, 248, 302, 310, 404, 505, 604, 620, 755, 808, 1010, 1208, 1240, 1510, 2020, 3020, 3131, 4040, 4681, 6040, 6262, 9362, 12524, 15251, 15655, 18724, 23405, 25048, 30502, 31310, 37448, 46810, 61004, 62620, 76255, 93620, 122008, 125240, 152510, 187240, 305020, 472781, 610040, 945562, 1891124, 2363905, 3782248, 4727810, 9455620, 18911240]

約数ペア:

[(1, 18911240), (2, 9455620), (4, 4727810), (5, 3782248), (8, 2363905), (10, 1891124), (20, 945562), (31, 610040), (40, 472781), (62, 305020), (101, 187240), (124, 152510), (151, 125240), (155, 122008), (202, 93620), (248, 76255), (302, 62620), (310, 61004), (404, 46810), (505, 37448), (604, 31310), (620, 30502), (755, 25048), (808, 23405), (1010, 18724), (1208, 15655), (1240, 15251), (1510, 12524), (2020, 9362), (3020, 6262), (3131, 6040), (4040, 4681)]