21801860

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{101}}^1\times {\mathrm{251}}^1$

素因数の和:404

約数の個数: 48

約数和(自身を含む): 47500992

約数和(自身を除く): 25699132

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 101, 172, 202, 215, 251, 404, 430, 502, 505, 860, 1004, 1010, 1255, 2020, 2510, 4343, 5020, 8686, 10793, 17372, 21586, 21715, 25351, 43172, 43430, 50702, 53965, 86860, 101404, 107930, 126755, 215860, 253510, 507020, 1090093, 2180186, 4360372, 5450465, 10900930, 21801860]

約数ペア:

[(1, 21801860), (2, 10900930), (4, 5450465), (5, 4360372), (10, 2180186), (20, 1090093), (43, 507020), (86, 253510), (101, 215860), (172, 126755), (202, 107930), (215, 101404), (251, 86860), (404, 53965), (430, 50702), (502, 43430), (505, 43172), (860, 25351), (1004, 21715), (1010, 21586), (1255, 17372), (2020, 10793), (2510, 8686), (4343, 5020)]