21316815

素因数分解:

$3^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{2803}}^1$

素因数の和:2840

約数の個数: 36

約数和(自身を含む): 40024296

約数和(自身を除く): 18707481

約数列:

[1, 3, 5, 9, 13, 15, 39, 45, 65, 117, 169, 195, 507, 585, 845, 1521, 2535, 2803, 7605, 8409, 14015, 25227, 36439, 42045, 109317, 126135, 182195, 327951, 473707, 546585, 1421121, 1639755, 2368535, 4263363, 7105605, 21316815]

約数ペア:

[(1, 21316815), (3, 7105605), (5, 4263363), (9, 2368535), (13, 1639755), (15, 1421121), (39, 546585), (45, 473707), (65, 327951), (117, 182195), (169, 126135), (195, 109317), (507, 42045), (585, 36439), (845, 25227), (1521, 14015), (2535, 8409), (2803, 7605)]