20493140

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{89}}^1\times {\mathrm{397}}^1$

素因数の和:524

約数の個数: 48

約数和(自身を含む): 45133200

約数和(自身を除く): 24640060

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 89, 116, 145, 178, 290, 356, 397, 445, 580, 794, 890, 1588, 1780, 1985, 2581, 3970, 5162, 7940, 10324, 11513, 12905, 23026, 25810, 35333, 46052, 51620, 57565, 70666, 115130, 141332, 176665, 230260, 353330, 706660, 1024657, 2049314, 4098628, 5123285, 10246570, 20493140]

約数ペア:

[(1, 20493140), (2, 10246570), (4, 5123285), (5, 4098628), (10, 2049314), (20, 1024657), (29, 706660), (58, 353330), (89, 230260), (116, 176665), (145, 141332), (178, 115130), (290, 70666), (356, 57565), (397, 51620), (445, 46052), (580, 35333), (794, 25810), (890, 23026), (1588, 12905), (1780, 11513), (1985, 10324), (2581, 7940), (3970, 5162)]