20218423842 has 24 divisors (see below), whose sum is σ = 43874738544. Its totient is φ = 6728989464.

The previous prime is 20218423837. The next prime is 20218423853. The reversal of 20218423842 is 24832481202.

20218423842 is a `hidden beast` number, since 20 + 218 + 42 + 384 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20218423797 and 20218423806.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 861868 + ... + 885015.

It is an arithmetic number, because the mean of its divisors is an integer number (1828114106).

Almost surely, 2^20218423842 is an apocalyptic number.

20218423842 is an abundant number, since it is smaller than the sum of its proper divisors (23656314702).

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

20218423842 is a wasteful number, since it uses less digits than its factorization.

20218423842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747534 (or 1747531 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The spelling of 20218423842 in words is "twenty billion, two hundred eighteen million, four hundred twenty-three thousand, eight hundred forty-two".