20641324542 has 16 divisors (see below), whose sum is σ = 41498790912. Its totient is φ = 6844417880.

The previous prime is 20641324453. The next prime is 20641324547. The reversal of 20641324542 is 24542314602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641324547) 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, 9004668 + ... + 9006959.

It is an arithmetic number, because the mean of its divisors is an integer number (2593674432).

Almost surely, 2^20641324542 is an apocalyptic number.

20641324542 is an abundant number, since it is smaller than the sum of its proper divisors (20857466370).

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

20641324542 is a wasteful number, since it uses less digits than its factorization.

20641324542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18011823.

The product of its (nonzero) digits is 46080, while the sum is 33.

The spelling of 20641324542 in words is "twenty billion, six hundred forty-one million, three hundred twenty-four thousand, five hundred forty-two".