21328580

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{11719}}^1$

素因数の和:11748

約数の個数: 48

約数和(自身を含む): 55130880

約数和(自身を除く): 33802300

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 65, 70, 91, 130, 140, 182, 260, 364, 455, 910, 1820, 11719, 23438, 46876, 58595, 82033, 117190, 152347, 164066, 234380, 304694, 328132, 410165, 609388, 761735, 820330, 1066429, 1523470, 1640660, 2132858, 3046940, 4265716, 5332145, 10664290, 21328580]

約数ペア:

[(1, 21328580), (2, 10664290), (4, 5332145), (5, 4265716), (7, 3046940), (10, 2132858), (13, 1640660), (14, 1523470), (20, 1066429), (26, 820330), (28, 761735), (35, 609388), (52, 410165), (65, 328132), (70, 304694), (91, 234380), (130, 164066), (140, 152347), (182, 117190), (260, 82033), (364, 58595), (455, 46876), (910, 23438), (1820, 11719)]