20742578706 has 16 divisors (see below), whose sum is σ = 41568300000. Its totient is φ = 6900335808.

The previous prime is 20742578663. The next prime is 20742578707. The reversal of 20742578706 is 60787524702.

It is not an unprimeable number, because it can be changed into a prime (20742578707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3461031 + ... + 3467018.

It is an arithmetic number, because the mean of its divisors is an integer number (2598018750).

Almost surely, 2^20742578706 is an apocalyptic number.

20742578706 is an abundant number, since it is smaller than the sum of its proper divisors (20825721294).

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

20742578706 is a wasteful number, since it uses less digits than its factorization.

20742578706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6928553.

The product of its (nonzero) digits is 1317120, while the sum is 48.

The spelling of 20742578706 in words is "twenty billion, seven hundred forty-two million, five hundred seventy-eight thousand, seven hundred six".