20321051 has 12 divisors (see below), whose sum is σ = 21634704. Its totient is φ = 19083600.

The previous prime is 20321039. The next prime is 20321053. The reversal of 20321051 is 15012302.

It is a happy number.

It is not a de Polignac number, because 20321051 - 2⁶ = 20320987 is a prime.

It is a super-2 number, since 2×20321051² = 825890227489202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20321053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65186 + ... + 65496.

It is an arithmetic number, because the mean of its divisors is an integer number (1802892).

Almost surely, 2^20321051 is an apocalyptic number.

20321051 is a deficient number, since it is larger than the sum of its proper divisors (1313653).

20321051 is a wasteful number, since it uses less digits than its factorization.

20321051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 511 counting only the distinct ones).

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

The square root of 20321051 is about 4507.8876427879. The cubic root of 20321051 is about 272.8865025756.

Adding to 20321051 its reverse (15012302), we get a palindrome (35333353).

The spelling of 20321051 in words is "twenty million, three hundred twenty-one thousand, fifty-one".