20547440818 has 16 divisors (see below), whose sum is σ = 31887360000. Its totient is φ = 9918396432.

The previous prime is 20547440791. The next prime is 20547440819. The reversal of 20547440818 is 81804474502.

It is not an unprimeable number, because it can be changed into a prime (20547440819) 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, 993103 + ... + 1013581.

It is an arithmetic number, because the mean of its divisors is an integer number (1992960000).

Almost surely, 2^20547440818 is an apocalyptic number.

20547440818 is a deficient number, since it is larger than the sum of its proper divisors (11339919182).

20547440818 is a wasteful number, since it uses less digits than its factorization.

20547440818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37809.

The product of its (nonzero) digits is 286720, while the sum is 43.

The spelling of 20547440818 in words is "twenty billion, five hundred forty-seven million, four hundred forty thousand, eight hundred eighteen".