20778788580 has 96 divisors (see below), whose sum is σ = 64098373248. Its totient is φ = 4987392000.

The previous prime is 20778788573. The next prime is 20778788587. The reversal of 20778788580 is 8588787702.

It is an interprime number because it is at equal distance from previous prime (20778788573) and next prime (20778788587).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (20778788587) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89197 + ... + 222516.

It is an arithmetic number, because the mean of its divisors is an integer number (667691388).

Almost surely, 2^20778788580 is an apocalyptic number.

20778788580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20778788580 is an abundant number, since it is smaller than the sum of its proper divisors (43319584668).

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

20778788580 is a wasteful number, since it uses less digits than its factorization.

20778788580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311837 (or 311835 counting only the distinct ones).

The product of its (nonzero) digits is 14049280, while the sum is 60.

It can be divided in two parts, 207 and 78788580, that added together give a palindrome (78788787).

The spelling of 20778788580 in words is "twenty billion, seven hundred seventy-eight million, seven hundred eighty-eight thousand, five hundred eighty".