20720512 has 16 divisors (see below), whose sum is σ = 41279400. Its totient is φ = 10360192.

The previous prime is 20720459. The next prime is 20720519. The reversal of 20720512 is 21502702.

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 20720512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80812 + ... + 81067.

Almost surely, 2^20720512 is an apocalyptic number.

It is an amenable number.

20720512 is a deficient number, since it is larger than the sum of its proper divisors (20558888).

20720512 is an equidigital number, since it uses as much as digits as its factorization.

20720512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161893 (or 161881 counting only the distinct ones).

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

The square root of 20720512 is about 4551.9789103202. The cubic root of 20720512 is about 274.6630009670.

The spelling of 20720512 in words is "twenty million, seven hundred twenty thousand, five hundred twelve".