20213051 has 4 divisors (see below), whose sum is σ = 21402072. Its totient is φ = 19024032.

The previous prime is 20213047. The next prime is 20213059. The reversal of 20213051 is 15031202.

It is a happy number.

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 20213051 - 2² = 20213047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20213059) 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, 594485 + ... + 594518.

It is an arithmetic number, because the mean of its divisors is an integer number (5350518).

Almost surely, 2^20213051 is an apocalyptic number.

20213051 is a deficient number, since it is larger than the sum of its proper divisors (1189021).

20213051 is a wasteful number, since it uses less digits than its factorization.

20213051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189020.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 20213051 is about 4495.8926811035. The cubic root of 20213051 is about 272.4022082675.

Adding to 20213051 its reverse (15031202), we get a palindrome (35244253).

The spelling of 20213051 in words is "twenty million, two hundred thirteen thousand, fifty-one".