20778752 has 36 divisors (see below), whose sum is σ = 43291920. Its totient is φ = 9934848.

The previous prime is 20778749. The next prime is 20778757. The reversal of 20778752 is 25787702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20778757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4124 + ... + 7652.

Almost surely, 2^20778752 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 20778752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21645960).

20778752 is an abundant number, since it is smaller than the sum of its proper divisors (22513168).

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

20778752 is an equidigital number, since it uses as much as digits as its factorization.

20778752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3568 (or 3554 counting only the distinct ones).

The product of its (nonzero) digits is 54880, while the sum is 38.

The square root of 20778752 is about 4558.3716390834. The cubic root of 20778752 is about 274.9200957935.

The spelling of 20778752 in words is "twenty million, seven hundred seventy-eight thousand, seven hundred fifty-two".