21119215

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{47}}^1\times {\mathrm{223}}^1$

素因数の和:319

約数の個数: 32

約数和(自身を含む): 28901376

約数和(自身を除く): 7782161

約数列:

[1, 5, 13, 31, 47, 65, 155, 223, 235, 403, 611, 1115, 1457, 2015, 2899, 3055, 6913, 7285, 10481, 14495, 18941, 34565, 52405, 89869, 94705, 136253, 324911, 449345, 681265, 1624555, 4223843, 21119215]

約数ペア:

[(1, 21119215), (5, 4223843), (13, 1624555), (31, 681265), (47, 449345), (65, 324911), (155, 136253), (223, 94705), (235, 89869), (403, 52405), (611, 34565), (1115, 18941), (1457, 14495), (2015, 10481), (2899, 7285), (3055, 6913)]