20952491 has 4 divisors (see below), whose sum is σ = 23945712. Its totient is φ = 17959272.

The previous prime is 20952479. The next prime is 20952521. The reversal of 20952491 is 19425902.

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

It is a cyclic number.

It is not a de Polignac number, because 20952491 - 2¹⁰ = 20951467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20952401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1496600 + ... + 1496613.

It is an arithmetic number, because the mean of its divisors is an integer number (5986428).

Almost surely, 2^20952491 is an apocalyptic number.

20952491 is a deficient number, since it is larger than the sum of its proper divisors (2993221).

20952491 is an equidigital number, since it uses as much as digits as its factorization.

20952491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2993220.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 20952491 is about 4577.3891029713. The cubic root of 20952491 is about 275.6842070075.

The spelling of 20952491 in words is "twenty million, nine hundred fifty-two thousand, four hundred ninety-one".