20779799040 has 1920 divisors, whose sum is σ = 104240328192. Its totient is φ = 3680501760.

The previous prime is 20779799039. The next prime is 20779799087. The reversal of 20779799040 is 4099797702.

It is a tau number, because it is divible by the number of its divisors (1920).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 392071654 + ... + 392071706.

Almost surely, 2^20779799040 is an apocalyptic number.

20779799040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20779799040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52120164096).

20779799040 is an abundant number, since it is smaller than the sum of its proper divisors (83460529152).

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

20779799040 is a wasteful number, since it uses less digits than its factorization.

20779799040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 2000376, while the sum is 54.

The spelling of 20779799040 in words is "twenty billion, seven hundred seventy-nine million, seven hundred ninety-nine thousand, forty".