20532921 has 4 divisors (see below), whose sum is σ = 27377232. Its totient is φ = 13688612.

The previous prime is 20532917. The next prime is 20532949. The reversal of 20532921 is 12923502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20532921 - 2² = 20532917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20532891 and 20532900.

It is not an unprimeable number, because it can be changed into a prime (20532961) 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, 3422151 + ... + 3422156.

It is an arithmetic number, because the mean of its divisors is an integer number (6844308).

Almost surely, 2^20532921 is an apocalyptic number.

It is an amenable number.

20532921 is a deficient number, since it is larger than the sum of its proper divisors (6844311).

20532921 is an equidigital number, since it uses as much as digits as its factorization.

20532921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6844310.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20532921 is about 4531.3266269383. The cubic root of 20532921 is about 273.8316092875.

The spelling of 20532921 in words is "twenty million, five hundred thirty-two thousand, nine hundred twenty-one".