20780364 has 24 divisors (see below), whose sum is σ = 52895808. Its totient is φ = 6297040.

The previous prime is 20780329. The next prime is 20780369. The reversal of 20780364 is 46308702.

It is not an unprimeable number, because it can be changed into a prime (20780369) 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, 78582 + ... + 78845.

It is an arithmetic number, because the mean of its divisors is an integer number (2203992).

Almost surely, 2^20780364 is an apocalyptic number.

It is an amenable number.

20780364 is an abundant number, since it is smaller than the sum of its proper divisors (32115444).

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

20780364 is a wasteful number, since it uses less digits than its factorization.

20780364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157445 (or 157443 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20780364 is about 4558.5484531811. The cubic root of 20780364 is about 274.9272049746.

The spelling of 20780364 in words is "twenty million, seven hundred eighty thousand, three hundred sixty-four".