20911545

素因数分解:

$3^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{101}}^1\times {\mathrm{107}}^1$

素因数の和:262

約数の個数: 48

約数和(自身を含む): 37806912

約数和(自身を除く): 16895367

約数列:

[1, 3, 5, 9, 15, 43, 45, 101, 107, 129, 215, 303, 321, 387, 505, 535, 645, 909, 963, 1515, 1605, 1935, 4343, 4545, 4601, 4815, 10807, 13029, 13803, 21715, 23005, 32421, 39087, 41409, 54035, 65145, 69015, 97263, 162105, 195435, 207045, 464701, 486315, 1394103, 2323505, 4182309, 6970515, 20911545]

約数ペア:

[(1, 20911545), (3, 6970515), (5, 4182309), (9, 2323505), (15, 1394103), (43, 486315), (45, 464701), (101, 207045), (107, 195435), (129, 162105), (215, 97263), (303, 69015), (321, 65145), (387, 54035), (505, 41409), (535, 39087), (645, 32421), (909, 23005), (963, 21715), (1515, 13803), (1605, 13029), (1935, 10807), (4343, 4815), (4545, 4601)]