21012615

素因数分解:

$3^4\times 5^1\times {\mathrm{13}}^2\times {\mathrm{307}}^1$

素因数の和:350

約数の個数: 60

約数和(自身を含む): 40920264

約数和(自身を除く): 19907649

約数列:

[1, 3, 5, 9, 13, 15, 27, 39, 45, 65, 81, 117, 135, 169, 195, 307, 351, 405, 507, 585, 845, 921, 1053, 1521, 1535, 1755, 2535, 2763, 3991, 4563, 4605, 5265, 7605, 8289, 11973, 13689, 13815, 19955, 22815, 24867, 35919, 41445, 51883, 59865, 68445, 107757, 124335, 155649, 179595, 259415, 323271, 466947, 538785, 778245, 1400841, 1616355, 2334735, 4202523, 7004205, 21012615]

約数ペア:

[(1, 21012615), (3, 7004205), (5, 4202523), (9, 2334735), (13, 1616355), (15, 1400841), (27, 778245), (39, 538785), (45, 466947), (65, 323271), (81, 259415), (117, 179595), (135, 155649), (169, 124335), (195, 107757), (307, 68445), (351, 59865), (405, 51883), (507, 41445), (585, 35919), (845, 24867), (921, 22815), (1053, 19955), (1521, 13815), (1535, 13689), (1755, 11973), (2535, 8289), (2763, 7605), (3991, 5265), (4563, 4605)]