21208280

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{47}}^1\times {\mathrm{389}}^1$

素因数の和:476

約数の個数: 64

約数和(自身を含む): 50544000

約数和(自身を除く): 29335720

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 47, 58, 94, 116, 145, 188, 232, 235, 290, 376, 389, 470, 580, 778, 940, 1160, 1363, 1556, 1880, 1945, 2726, 3112, 3890, 5452, 6815, 7780, 10904, 11281, 13630, 15560, 18283, 22562, 27260, 36566, 45124, 54520, 56405, 73132, 90248, 91415, 112810, 146264, 182830, 225620, 365660, 451240, 530207, 731320, 1060414, 2120828, 2651035, 4241656, 5302070, 10604140, 21208280]

約数ペア:

[(1, 21208280), (2, 10604140), (4, 5302070), (5, 4241656), (8, 2651035), (10, 2120828), (20, 1060414), (29, 731320), (40, 530207), (47, 451240), (58, 365660), (94, 225620), (116, 182830), (145, 146264), (188, 112810), (232, 91415), (235, 90248), (290, 73132), (376, 56405), (389, 54520), (470, 45124), (580, 36566), (778, 27260), (940, 22562), (1160, 18283), (1363, 15560), (1556, 13630), (1880, 11281), (1945, 10904), (2726, 7780), (3112, 6815), (3890, 5452)]