20745228 has 36 divisors (see below), whose sum is σ = 56310072. Its totient is φ = 5927040.

The previous prime is 20745217. The next prime is 20745233. The reversal of 20745228 is 82254702.

It is a junction number, because it is equal to n+sod(n) for n = 20745195 and 20745204.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17053 + ... + 18228.

Almost surely, 2^20745228 is an apocalyptic number.

20745228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20745228 is an abundant number, since it is smaller than the sum of its proper divisors (35564844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20745228 is a wasteful number, since it uses less digits than its factorization.

20745228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35302 (or 35293 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 20745228 is about 4554.6929644050. The cubic root of 20745228 is about 274.7721661157.

Multiplying 20745228 by its sum of digits (30), we get a triangular number (622356840 = T₃₅₂₈₀).

The spelling of 20745228 in words is "twenty million, seven hundred forty-five thousand, two hundred twenty-eight".