20513228 has 6 divisors (see below), whose sum is σ = 35898156. Its totient is φ = 10256612.

The previous prime is 20513191. The next prime is 20513231. The reversal of 20513228 is 82231502.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2564150 + ... + 2564157.

It is an arithmetic number, because the mean of its divisors is an integer number (5983026).

Almost surely, 2^20513228 is an apocalyptic number.

It is an amenable number.

20513228 is a deficient number, since it is larger than the sum of its proper divisors (15384928).

20513228 is a wasteful number, since it uses less digits than its factorization.

20513228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128311 (or 5128309 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20513228 is about 4529.1531217215. The cubic root of 20513228 is about 273.7440378732.

The spelling of 20513228 in words is "twenty million, five hundred thirteen thousand, two hundred twenty-eight".