20437546818 has 16 divisors (see below), whose sum is σ = 44019331776. Its totient is φ = 6288475920.

The previous prime is 20437546807. The next prime is 20437546819. The reversal of 20437546818 is 81864573402.

It is not an unprimeable number, because it can be changed into a prime (20437546819) 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, 131009838 + ... + 131009993.

It is an arithmetic number, because the mean of its divisors is an integer number (2751208236).

Almost surely, 2^20437546818 is an apocalyptic number.

20437546818 is an abundant number, since it is smaller than the sum of its proper divisors (23581784958).

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

20437546818 is a wasteful number, since it uses less digits than its factorization.

20437546818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262019849.

The product of its (nonzero) digits is 1290240, while the sum is 48.

The spelling of 20437546818 in words is "twenty billion, four hundred thirty-seven million, five hundred forty-six thousand, eight hundred eighteen".