20206905992 has 128 divisors (see below), whose sum is σ = 49476403200. Its totient is φ = 7512922368.

The previous prime is 20206905947. The next prime is 20206906033. The reversal of 20206905992 is 29950960202.

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, 1750913 + ... + 1762415.

It is an arithmetic number, because the mean of its divisors is an integer number (386534400).

Almost surely, 2^20206905992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20206905992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24738201600).

20206905992 is an abundant number, since it is smaller than the sum of its proper divisors (29269497208).

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

20206905992 is a wasteful number, since it uses less digits than its factorization.

20206905992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11675 (or 11671 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 44.

The spelling of 20206905992 in words is "twenty billion, two hundred six million, nine hundred five thousand, nine hundred ninety-two".