20198523743 has 4 divisors (see below), whose sum is σ = 21261603960. Its totient is φ = 19135443528.

The previous prime is 20198523733. The next prime is 20198523757. The reversal of 20198523743 is 34732589102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34732589102 = 2 ⋅17366294551.

It is a cyclic number.

It is not a de Polignac number, because 20198523743 - 2⁴ = 20198523727 is a prime.

It is a super-2 number, since 2×20198523743² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20198523694 and 20198523703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20198523733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531540080 + ... + 531540117.

It is an arithmetic number, because the mean of its divisors is an integer number (5315400990).

Almost surely, 2^20198523743 is an apocalyptic number.

20198523743 is a deficient number, since it is larger than the sum of its proper divisors (1063080217).

20198523743 is a wasteful number, since it uses less digits than its factorization.

20198523743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063080216.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 20198523743 in words is "twenty billion, one hundred ninety-eight million, five hundred twenty-three thousand, seven hundred forty-three".