20228764 has 6 divisors (see below), whose sum is σ = 35400344. Its totient is φ = 10114380.

The previous prime is 20228743. The next prime is 20228777. The reversal of 20228764 is 46782202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2528592 + ... + 2528599.

Almost surely, 2^20228764 is an apocalyptic number.

It is an amenable number.

20228764 is a deficient number, since it is larger than the sum of its proper divisors (15171580).

20228764 is a wasteful number, since it uses less digits than its factorization.

20228764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5057195 (or 5057193 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 20228764 is about 4497.6398255085. The cubic root of 20228764 is about 272.4727756659.

The spelling of 20228764 in words is "twenty million, two hundred twenty-eight thousand, seven hundred sixty-four".