21648393

素因数分解:

$3^2\times {\mathrm{13}}^2\times {\mathrm{43}}^1\times {\mathrm{331}}^1$

素因数の和:406

約数の個数: 36

約数和(自身を含む): 34752432

約数和(自身を除く): 13104039

約数列:

[1, 3, 9, 13, 39, 43, 117, 129, 169, 331, 387, 507, 559, 993, 1521, 1677, 2979, 4303, 5031, 7267, 12909, 14233, 21801, 38727, 42699, 55939, 65403, 128097, 167817, 185029, 503451, 555087, 1665261, 2405377, 7216131, 21648393]

約数ペア:

[(1, 21648393), (3, 7216131), (9, 2405377), (13, 1665261), (39, 555087), (43, 503451), (117, 185029), (129, 167817), (169, 128097), (331, 65403), (387, 55939), (507, 42699), (559, 38727), (993, 21801), (1521, 14233), (1677, 12909), (2979, 7267), (4303, 5031)]