20745100 has 36 divisors (see below), whose sum is σ = 47668824. Its totient is φ = 7809280.

The previous prime is 20745091. The next prime is 20745119. The reversal of 20745100 is 154702.

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, 4402 + ... + 7801.

It is an arithmetic number, because the mean of its divisors is an integer number (1324134).

Almost surely, 2^20745100 is an apocalyptic number.

20745100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20745100 is an abundant number, since it is smaller than the sum of its proper divisors (26923724).

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

20745100 is a wasteful number, since it uses less digits than its factorization.

20745100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12234 (or 12227 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20745100 is about 4554.6789129422. The cubic root of 20745100 is about 274.7716009912.

Adding to 20745100 its reverse (154702), we get a palindrome (20899802).

The spelling of 20745100 in words is "twenty million, seven hundred forty-five thousand, one hundred".