20712066018 has 32 divisors (see below), whose sum is σ = 47714648064. Its totient is φ = 5871135312.

The previous prime is 20712065993. The next prime is 20712066019. The reversal of 20712066018 is 81066021702.

It is a self number, because there is not a number n which added to its sum of digits gives 20712066018.

It is not an unprimeable number, because it can be changed into a prime (20712066019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1936180 + ... + 1946847.

It is an arithmetic number, because the mean of its divisors is an integer number (1491082752).

Almost surely, 2^20712066018 is an apocalyptic number.

20712066018 is an abundant number, since it is smaller than the sum of its proper divisors (27002582046).

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

20712066018 is a wasteful number, since it uses less digits than its factorization.

20712066018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3883166.

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 20712066018 in words is "twenty billion, seven hundred twelve million, sixty-six thousand, eighteen".