20291779380 has 96 divisors (see below), whose sum is σ = 57137794560. Its totient is φ = 5380669440.

The previous prime is 20291779303. The next prime is 20291779451. The reversal of 20291779380 is 8397719202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16483365 + ... + 16484595.

It is an arithmetic number, because the mean of its divisors is an integer number (595185360).

Almost surely, 2^20291779380 is an apocalyptic number.

20291779380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20291779380 is an abundant number, since it is smaller than the sum of its proper divisors (36846015180).

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

20291779380 is a wasteful number, since it uses less digits than its factorization.

20291779380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2569 (or 2567 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 48.

The spelling of 20291779380 in words is "twenty billion, two hundred ninety-one million, seven hundred seventy-nine thousand, three hundred eighty".