81201980

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{101}}^1\times {\mathrm{659}}^1$

素因数の和:830

約数の個数: 48

約数和(自身を含む): 175301280

約数和(自身を除く): 94099300

約数列:

[1, 2, 4, 5, 10, 20, 61, 101, 122, 202, 244, 305, 404, 505, 610, 659, 1010, 1220, 1318, 2020, 2636, 3295, 6161, 6590, 12322, 13180, 24644, 30805, 40199, 61610, 66559, 80398, 123220, 133118, 160796, 200995, 266236, 332795, 401990, 665590, 803980, 1331180, 4060099, 8120198, 16240396, 20300495, 40600990, 81201980]

約数ペア:

[(1, 81201980), (2, 40600990), (4, 20300495), (5, 16240396), (10, 8120198), (20, 4060099), (61, 1331180), (101, 803980), (122, 665590), (202, 401990), (244, 332795), (305, 266236), (404, 200995), (505, 160796), (610, 133118), (659, 123220), (1010, 80398), (1220, 66559), (1318, 61610), (2020, 40199), (2636, 30805), (3295, 24644), (6161, 13180), (6590, 12322)]