20243871742 has 4 divisors (see below), whose sum is σ = 30365807616. Its totient is φ = 10121935870.

The previous prime is 20243871733. The next prime is 20243871749. The reversal of 20243871742 is 24717834202.

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

It is a super-2 number, since 2×20243871742² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 20243871695 and 20243871704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20243871749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5060967934 + ... + 5060967937.

It is an arithmetic number, because the mean of its divisors is an integer number (7591451904).

Almost surely, 2^20243871742 is an apocalyptic number.

20243871742 is a deficient number, since it is larger than the sum of its proper divisors (10121935874).

20243871742 is a wasteful number, since it uses less digits than its factorization.

20243871742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10121935873.

The product of its (nonzero) digits is 150528, while the sum is 40.

The spelling of 20243871742 in words is "twenty billion, two hundred forty-three million, eight hundred seventy-one thousand, seven hundred forty-two".