20745234 has 40 divisors (see below), whose sum is σ = 47754828. Its totient is φ = 6726240.

The previous prime is 20745233. The next prime is 20745239. The reversal of 20745234 is 43254702.

20745234 is a `hidden beast` number, since 207 + 452 + 3 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20657025 + 88209 = 4545^2 + 297^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20745198 and 20745207.

It is not an unprimeable number, because it can be changed into a prime (20745233) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4264 + ... + 7724.

Almost surely, 2^20745234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20745234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23877414).

20745234 is an abundant number, since it is smaller than the sum of its proper divisors (27009594).

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

20745234 is a wasteful number, since it uses less digits than its factorization.

20745234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3512 (or 3503 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 20745234 is about 4554.6936230662. The cubic root of 20745234 is about 274.7721926058.

Adding to 20745234 its reverse (43254702), we get a palindrome (63999936).

The spelling of 20745234 in words is "twenty million, seven hundred forty-five thousand, two hundred thirty-four".