21628780

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{89}}^1\times {\mathrm{419}}^1$

素因数の和:546

約数の個数: 48

約数和(自身を含む): 47628000

約数和(自身を除く): 25999220

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 89, 116, 145, 178, 290, 356, 419, 445, 580, 838, 890, 1676, 1780, 2095, 2581, 4190, 5162, 8380, 10324, 12151, 12905, 24302, 25810, 37291, 48604, 51620, 60755, 74582, 121510, 149164, 186455, 243020, 372910, 745820, 1081439, 2162878, 4325756, 5407195, 10814390, 21628780]

約数ペア:

[(1, 21628780), (2, 10814390), (4, 5407195), (5, 4325756), (10, 2162878), (20, 1081439), (29, 745820), (58, 372910), (89, 243020), (116, 186455), (145, 149164), (178, 121510), (290, 74582), (356, 60755), (419, 51620), (445, 48604), (580, 37291), (838, 25810), (890, 24302), (1676, 12905), (1780, 12151), (2095, 10324), (2581, 8380), (4190, 5162)]