20707764 has 96 divisors (see below), whose sum is σ = 61264896. Its totient is φ = 5287680.

The previous prime is 20707759. The next prime is 20707781. The reversal of 20707764 is 46770702.

It is a happy number.

It is a super-2 number, since 2×20707764² = 857622979759392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67299 + ... + 67605.

It is an arithmetic number, because the mean of its divisors is an integer number (638176).

Almost surely, 2^20707764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20707764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30632448).

20707764 is an abundant number, since it is smaller than the sum of its proper divisors (40557132).

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

20707764 is a wasteful number, since it uses less digits than its factorization.

20707764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 33.

The square root of 20707764 is about 4550.5784247720. The cubic root of 20707764 is about 274.6066619112.

The spelling of 20707764 in words is "twenty million, seven hundred seven thousand, seven hundred sixty-four".