21420760

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8779}}^1$

素因数の和:8851

約数の個数: 32

約数和(自身を含む): 48992400

約数和(自身を除く): 27571640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8779, 17558, 35116, 43895, 70232, 87790, 175580, 351160, 535519, 1071038, 2142076, 2677595, 4284152, 5355190, 10710380, 21420760]

約数ペア:

[(1, 21420760), (2, 10710380), (4, 5355190), (5, 4284152), (8, 2677595), (10, 2142076), (20, 1071038), (40, 535519), (61, 351160), (122, 175580), (244, 87790), (305, 70232), (488, 43895), (610, 35116), (1220, 17558), (2440, 8779)]