20164250542 has 4 divisors (see below), whose sum is σ = 30246375816. Its totient is φ = 10082125270.

The previous prime is 20164250531. The next prime is 20164250563. The reversal of 20164250542 is 24505246102.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5041062634 + ... + 5041062637.

It is an arithmetic number, because the mean of its divisors is an integer number (7561593954).

Almost surely, 2^20164250542 is an apocalyptic number.

20164250542 is a deficient number, since it is larger than the sum of its proper divisors (10082125274).

20164250542 is a wasteful number, since it uses less digits than its factorization.

20164250542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10082125273.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 20164250542 its reverse (24505246102), we get a palindrome (44669496644).

The spelling of 20164250542 in words is "twenty billion, one hundred sixty-four million, two hundred fifty thousand, five hundred forty-two".