20646142 has 16 divisors (see below), whose sum is σ = 33894000. Its totient is φ = 9354240.

The previous prime is 20646137. The next prime is 20646151. The reversal of 20646142 is 24164602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6334 + ... + 9022.

It is an arithmetic number, because the mean of its divisors is an integer number (2118375).

Almost surely, 2^20646142 is an apocalyptic number.

20646142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20646142 is a deficient number, since it is larger than the sum of its proper divisors (13247858).

20646142 is a wasteful number, since it uses less digits than its factorization.

20646142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3051.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20646142 is about 4543.8025925429. The cubic root of 20646142 is about 274.3340004948.

The spelling of 20646142 in words is "twenty million, six hundred forty-six thousand, one hundred forty-two".