20512704 has 56 divisors (see below), whose sum is σ = 57139840. Its totient is φ = 6476544.

The previous prime is 20512697. The next prime is 20512717. The reversal of 20512704 is 40721502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 837 + ... + 6459.

Almost surely, 2^20512704 is an apocalyptic number.

20512704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20512704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28569920).

20512704 is an abundant number, since it is smaller than the sum of its proper divisors (36627136).

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

20512704 is a wasteful number, since it uses less digits than its factorization.

20512704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5657 (or 5647 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20512704 is about 4529.0952738930. The cubic root of 20512704 is about 273.7417069692.

The spelling of 20512704 in words is "twenty million, five hundred twelve thousand, seven hundred four".