20780315055 has 12 divisors (see below), whose sum is σ = 36019212840. Its totient is φ = 11082834672.

The previous prime is 20780315047. The next prime is 20780315089. The reversal of 20780315055 is 55051308702.

It is not a de Polignac number, because 20780315055 - 2³ = 20780315047 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 230892345 + ... + 230892434.

It is an arithmetic number, because the mean of its divisors is an integer number (3001601070).

Almost surely, 2^20780315055 is an apocalyptic number.

20780315055 is a deficient number, since it is larger than the sum of its proper divisors (15238897785).

20780315055 is a wasteful number, since it uses less digits than its factorization.

20780315055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461784790 (or 461784787 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 36.

The spelling of 20780315055 in words is "twenty billion, seven hundred eighty million, three hundred fifteen thousand, fifty-five".