20434228 has 6 divisors (see below), whose sum is σ = 35759906. Its totient is φ = 10217112.

The previous prime is 20434223. The next prime is 20434231. The reversal of 20434228 is 82243402.

It can be written as a sum of positive squares in only one way, i.e., 20412324 + 21904 = 4518^2 + 148^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2554275 + ... + 2554282.

Almost surely, 2^20434228 is an apocalyptic number.

It is an amenable number.

20434228 is a deficient number, since it is larger than the sum of its proper divisors (15325678).

20434228 is a wasteful number, since it uses less digits than its factorization.

20434228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5108561 (or 5108559 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 20434228 is about 4520.4234314940. The cubic root of 20434228 is about 273.3921738617.

The spelling of 20434228 in words is "twenty million, four hundred thirty-four thousand, two hundred twenty-eight".