20743724434 has 4 divisors (see below), whose sum is σ = 31115586654. Its totient is φ = 10371862216.

The previous prime is 20743724401. The next prime is 20743724461. The reversal of 20743724434 is 43442734702.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 12387022209 + 8356702225 = 111297^2 + 91415^2 .

It is a super-3 number, since 3×20743724434³ (a number of 32 digits) contains 333 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 an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5185931107 + ... + 5185931110.

Almost surely, 2^20743724434 is an apocalyptic number.

20743724434 is a deficient number, since it is larger than the sum of its proper divisors (10371862220).

20743724434 is a wasteful number, since it uses less digits than its factorization.

20743724434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10371862219.

The product of its (nonzero) digits is 451584, while the sum is 40.

The spelling of 20743724434 in words is "twenty billion, seven hundred forty-three million, seven hundred twenty-four thousand, four hundred thirty-four".