20731051 has 12 divisors (see below), whose sum is σ = 23109016.
Its totient is φ = 18580320.
The previous prime is 20731049. The next prime is 20731057. The reversal of 20731051 is 15013702.
It is not a de Polignac number, because 20731051 - 21 = 20731049 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (20731057) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7660 + ... + 10006.
Almost surely, 220731051 is an apocalyptic number.
20731051 is a deficient number, since it is larger than the sum of its proper divisors (2377965).
20731051 is a wasteful number, since it uses less digits than its factorization.
20731051 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2442 (or 2431 counting only the distinct ones).
The product of its (nonzero) digits is 210, while the sum is 19.
The square root of 20731051 is about 4553.1363915437.
The cubic root of 20731051 is about 274.7095600278.
Adding to 20731051 its reverse (15013702), we get a palindrome (35744753).
The spelling of 20731051 in words is "twenty million, seven hundred thirty-one thousand, fifty-one".