20487780438 has 16 divisors (see below), whose sum is σ = 41007023616. Its totient is φ = 6824016360.

The previous prime is 20487780413. The next prime is 20487780451. The reversal of 20487780438 is 83408778402.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1302478 + ... + 1318113.

It is an arithmetic number, because the mean of its divisors is an integer number (2562938976).

Almost surely, 2^20487780438 is an apocalyptic number.

20487780438 is an abundant number, since it is smaller than the sum of its proper divisors (20519243178).

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

20487780438 is a wasteful number, since it uses less digits than its factorization.

20487780438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621899.

The product of its (nonzero) digits is 2408448, while the sum is 51.

The spelling of 20487780438 in words is "twenty billion, four hundred eighty-seven million, seven hundred eighty thousand, four hundred thirty-eight".