20778411438 has 72 divisors (see below), whose sum is σ = 49210117320. Its totient is φ = 6561524880.

The previous prime is 20778411403. The next prime is 20778411461. The reversal of 20778411438 is 83411487702.

20778411438 is a `hidden beast` number, since 207 + 7 + 8 + 4 + 1 + 1 + 438 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20778411393 and 20778411402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 207648 + ... + 290988.

Almost surely, 2^20778411438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20778411438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24605058660).

20778411438 is an abundant number, since it is smaller than the sum of its proper divisors (28431705882).

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

20778411438 is an frugal number, since it uses more digits than its factorization.

20778411438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83386 (or 83365 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The spelling of 20778411438 in words is "twenty billion, seven hundred seventy-eight million, four hundred eleven thousand, four hundred thirty-eight".