20122649 has 2 divisors, whose sum is σ = 20122650. Its totient is φ = 20122648.

The previous prime is 20122637. The next prime is 20122651. The reversal of 20122649 is 94622102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11526025 + 8596624 = 3395^2 + 2932^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122649 - 2¹⁶ = 20057113 is a prime.

Together with 20122651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20122699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061324 + 10061325.

It is an arithmetic number, because the mean of its divisors is an integer number (10061325).

Almost surely, 2^20122649 is an apocalyptic number.

It is an amenable number.

20122649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122649 is an equidigital number, since it uses as much as digits as its factorization.

20122649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20122649 is about 4485.8275713629. The cubic root of 20122649 is about 271.9954989523.

The spelling of 20122649 in words is "twenty million, one hundred twenty-two thousand, six hundred forty-nine".