20425542618 has 32 divisors (see below), whose sum is σ = 44101108800. Its totient is φ = 6269406336.

The previous prime is 20425542607. The next prime is 20425542661. The reversal of 20425542618 is 81624552402.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 288228 + ... + 352031.

It is an arithmetic number, because the mean of its divisors is an integer number (1378159650).

Almost surely, 2^20425542618 is an apocalyptic number.

20425542618 is an abundant number, since it is smaller than the sum of its proper divisors (23675566182).

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

20425542618 is a wasteful number, since it uses less digits than its factorization.

20425542618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640686.

The product of its (nonzero) digits is 153600, while the sum is 39.

The spelling of 20425542618 in words is "twenty billion, four hundred twenty-five million, five hundred forty-two thousand, six hundred eighteen".