16920641 has 2 divisors, whose sum is σ = 16920642. Its totient is φ = 16920640.

The previous prime is 16920599. The next prime is 16920643. The reversal of 16920641 is 14602961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13535041 + 3385600 = 3679^2 + 1840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16920641 is a prime.

Together with 16920643, 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 (16920643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8460320 + 8460321.

It is an arithmetic number, because the mean of its divisors is an integer number (8460321).

Almost surely, 2^16920641 is an apocalyptic number.

It is an amenable number.

16920641 is a deficient number, since it is larger than the sum of its proper divisors (1).

16920641 is an equidigital number, since it uses as much as digits as its factorization.

16920641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 16920641 is about 4113.4706757190. The cubic root of 16920641 is about 256.7274283161.

The spelling of 16920641 in words is "sixteen million, nine hundred twenty thousand, six hundred forty-one".