21809450

素因数分解:

$2^1\times 5^2\times {\mathrm{13}}^2\times {\mathrm{29}}^1\times {\mathrm{89}}^1$

素因数の和:156

約数の個数: 72

約数和(自身を含む): 45951300

約数和(自身を除く): 24141850

約数列:

[1, 2, 5, 10, 13, 25, 26, 29, 50, 58, 65, 89, 130, 145, 169, 178, 290, 325, 338, 377, 445, 650, 725, 754, 845, 890, 1157, 1450, 1690, 1885, 2225, 2314, 2581, 3770, 4225, 4450, 4901, 5162, 5785, 8450, 9425, 9802, 11570, 12905, 15041, 18850, 24505, 25810, 28925, 30082, 33553, 49010, 57850, 64525, 67106, 75205, 122525, 129050, 150410, 167765, 245050, 335530, 376025, 436189, 752050, 838825, 872378, 1677650, 2180945, 4361890, 10904725, 21809450]

約数ペア:

[(1, 21809450), (2, 10904725), (5, 4361890), (10, 2180945), (13, 1677650), (25, 872378), (26, 838825), (29, 752050), (50, 436189), (58, 376025), (65, 335530), (89, 245050), (130, 167765), (145, 150410), (169, 129050), (178, 122525), (290, 75205), (325, 67106), (338, 64525), (377, 57850), (445, 49010), (650, 33553), (725, 30082), (754, 28925), (845, 25810), (890, 24505), (1157, 18850), (1450, 15041), (1690, 12905), (1885, 11570), (2225, 9802), (2314, 9425), (2581, 8450), (3770, 5785), (4225, 5162), (4450, 4901)]