20512560 has 40 divisors (see below), whose sum is σ = 63589680. Its totient is φ = 5469952.

The previous prime is 20512543. The next prime is 20512561. The reversal of 20512560 is 6521502.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (20512561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42495 + ... + 42974.

It is an arithmetic number, because the mean of its divisors is an integer number (1589742).

Almost surely, 2^20512560 is an apocalyptic number.

20512560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20512560 is an abundant number, since it is smaller than the sum of its proper divisors (43077120).

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

20512560 is a wasteful number, since it uses less digits than its factorization.

20512560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85485 (or 85479 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 20512560 is about 4529.0793766504. The cubic root of 20512560 is about 273.7410664085.

The spelling of 20512560 in words is "twenty million, five hundred twelve thousand, five hundred sixty".