20646212 has 6 divisors (see below), whose sum is σ = 36130878. Its totient is φ = 10323104.

The previous prime is 20646187. The next prime is 20646221. The reversal of 20646212 is 21264602.

It can be written as a sum of positive squares in only one way, i.e., 12716356 + 7929856 = 3566^2 + 2816^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2580773 + ... + 2580780.

It is an arithmetic number, because the mean of its divisors is an integer number (6021813).

Almost surely, 2^20646212 is an apocalyptic number.

It is an amenable number.

20646212 is a deficient number, since it is larger than the sum of its proper divisors (15484666).

20646212 is a wasteful number, since it uses less digits than its factorization.

20646212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5161557 (or 5161555 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20646212 is about 4543.8102953358. The cubic root of 20646212 is about 274.3343105343.

The spelling of 20646212 in words is "twenty million, six hundred forty-six thousand, two hundred twelve".