20197980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{101}}^2$

素因数の和:228

約数の個数: 108

約数和(自身を含む): 67505256

約数和(自身を除く): 47307276

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 15, 18, 20, 22, 30, 33, 36, 44, 45, 55, 60, 66, 90, 99, 101, 110, 132, 165, 180, 198, 202, 220, 303, 330, 396, 404, 495, 505, 606, 660, 909, 990, 1010, 1111, 1212, 1515, 1818, 1980, 2020, 2222, 3030, 3333, 3636, 4444, 4545, 5555, 6060, 6666, 9090, 9999, 10201, 11110, 13332, 16665, 18180, 19998, 20402, 22220, 30603, 33330, 39996, 40804, 49995, 51005, 61206, 66660, 91809, 99990, 102010, 112211, 122412, 153015, 183618, 199980, 204020, 224422, 306030, 336633, 367236, 448844, 459045, 561055, 612060, 673266, 918090, 1009899, 1122110, 1346532, 1683165, 1836180, 2019798, 2244220, 3366330, 4039596, 5049495, 6732660, 10098990, 20197980]

約数ペア:

[(1, 20197980), (2, 10098990), (3, 6732660), (4, 5049495), (5, 4039596), (6, 3366330), (9, 2244220), (10, 2019798), (11, 1836180), (12, 1683165), (15, 1346532), (18, 1122110), (20, 1009899), (22, 918090), (30, 673266), (33, 612060), (36, 561055), (44, 459045), (45, 448844), (55, 367236), (60, 336633), (66, 306030), (90, 224422), (99, 204020), (101, 199980), (110, 183618), (132, 153015), (165, 122412), (180, 112211), (198, 102010), (202, 99990), (220, 91809), (303, 66660), (330, 61206), (396, 51005), (404, 49995), (495, 40804), (505, 39996), (606, 33330), (660, 30603), (909, 22220), (990, 20402), (1010, 19998), (1111, 18180), (1212, 16665), (1515, 13332), (1818, 11110), (1980, 10201), (2020, 9999), (2222, 9090), (3030, 6666), (3333, 6060), (3636, 5555), (4444, 4545)]