20953228 has 6 divisors (see below), whose sum is σ = 36668156. Its totient is φ = 10476612.

The previous prime is 20953223. The next prime is 20953243. The reversal of 20953228 is 82235902.

It is a self number, because there is not a number n which added to its sum of digits gives 20953228.

It is not an unprimeable number, because it can be changed into a prime (20953223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2619150 + ... + 2619157.

Almost surely, 2^20953228 is an apocalyptic number.

It is an amenable number.

20953228 is a deficient number, since it is larger than the sum of its proper divisors (15714928).

20953228 is a wasteful number, since it uses less digits than its factorization.

20953228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5238311 (or 5238309 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20953228 is about 4577.4696066714. The cubic root of 20953228 is about 275.6874393500.

The spelling of 20953228 in words is "twenty million, nine hundred fifty-three thousand, two hundred twenty-eight".