20646145 has 16 divisors (see below), whose sum is σ = 26836992. Its totient is φ = 15157440.

The previous prime is 20646137. The next prime is 20646151. The reversal of 20646145 is 54164602.

It is not a de Polignac number, because 20646145 - 2³ = 20646137 is a prime.

It is a super-2 number, since 2×20646145² = 852526606722050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11584 + ... + 13246.

It is an arithmetic number, because the mean of its divisors is an integer number (1677312).

Almost surely, 2^20646145 is an apocalyptic number.

It is an amenable number.

20646145 is a deficient number, since it is larger than the sum of its proper divisors (6190847).

20646145 is a wasteful number, since it uses less digits than its factorization.

20646145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20646145 is about 4543.8029226629. The cubic root of 20646145 is about 274.3340137822.

The spelling of 20646145 in words is "twenty million, six hundred forty-six thousand, one hundred forty-five".