20952913 has 4 divisors (see below), whose sum is σ = 21013300. Its totient is φ = 20892528.

The previous prime is 20952887. The next prime is 20952923. The reversal of 20952913 is 31925902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16257024 + 4695889 = 4032^2 + 2167^2 .

It is a cyclic number.

It is not a de Polignac number, because 20952913 - 2⁹ = 20952401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20952923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29670 + ... + 30367.

It is an arithmetic number, because the mean of its divisors is an integer number (5253325).

Almost surely, 2^20952913 is an apocalyptic number.

It is an amenable number.

20952913 is a deficient number, since it is larger than the sum of its proper divisors (60387).

20952913 is an equidigital number, since it uses as much as digits as its factorization.

20952913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60386.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 20952913 is about 4577.4351988859. The cubic root of 20952913 is about 275.6860578289.

The spelling of 20952913 in words is "twenty million, nine hundred fifty-two thousand, nine hundred thirteen".