20892921 has 8 divisors (see below), whose sum is σ = 31836864. Its totient is φ = 11938800.

The previous prime is 20892899. The next prime is 20892931. The reversal of 20892921 is 12929802.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20892921 - 2⁵ = 20892889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20892931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 497430 + ... + 497471.

It is an arithmetic number, because the mean of its divisors is an integer number (3979608).

Almost surely, 2^20892921 is an apocalyptic number.

20892921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20892921 is a deficient number, since it is larger than the sum of its proper divisors (10943943).

20892921 is an equidigital number, since it uses as much as digits as its factorization.

20892921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994911.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 20892921 is about 4570.8774868727. The cubic root of 20892921 is about 275.4226932104.

The spelling of 20892921 in words is "twenty million, eight hundred ninety-two thousand, nine hundred twenty-one".