20198523742 has 16 divisors (see below), whose sum is σ = 31363765632. Its totient is φ = 9745781760.

The previous prime is 20198523733. The next prime is 20198523757. The reversal of 20198523742 is 24732589102.

It is a super-2 number, since 2×20198523742² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439563 + ... + 483334.

It is an arithmetic number, because the mean of its divisors is an integer number (1960235352).

Almost surely, 2^20198523742 is an apocalyptic number.

20198523742 is a deficient number, since it is larger than the sum of its proper divisors (11165241890).

20198523742 is a wasteful number, since it uses less digits than its factorization.

20198523742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923283.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 20198523742 in words is "twenty billion, one hundred ninety-eight million, five hundred twenty-three thousand, seven hundred forty-two".