20537228 has 24 divisors (see below), whose sum is σ = 37225104. Its totient is φ = 9907200.

The previous prime is 20537227. The next prime is 20537243. The reversal of 20537228 is 82273502.

It is a self number, because there is not a number n which added to its sum of digits gives 20537228.

It is not an unprimeable number, because it can be changed into a prime (20537227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15263 + ... + 16553.

It is an arithmetic number, because the mean of its divisors is an integer number (1551046).

Almost surely, 2^20537228 is an apocalyptic number.

It is an amenable number.

20537228 is a deficient number, since it is larger than the sum of its proper divisors (16687876).

20537228 is a wasteful number, since it uses less digits than its factorization.

20537228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433 (or 1431 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20537228 is about 4531.8018491545. The cubic root of 20537228 is about 273.8507543195.

The spelling of 20537228 in words is "twenty million, five hundred thirty-seven thousand, two hundred twenty-eight".