20743724391 has 16 divisors (see below), whose sum is σ = 30290709120. Its totient is φ = 12549005280.

The previous prime is 20743724387. The next prime is 20743724401. The reversal of 20743724391 is 19342734702.

It is not a de Polignac number, because 20743724391 - 2² = 20743724387 is a prime.

It is a super-3 number, since 3×20743724391³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20743725391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4505245 + ... + 4509846.

It is an arithmetic number, because the mean of its divisors is an integer number (1893169320).

Almost surely, 2^20743724391 is an apocalyptic number.

20743724391 is a deficient number, since it is larger than the sum of its proper divisors (9546984729).

20743724391 is a wasteful number, since it uses less digits than its factorization.

20743724391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9015166.

The product of its (nonzero) digits is 254016, while the sum is 42.

The spelling of 20743724391 in words is "twenty billion, seven hundred forty-three million, seven hundred twenty-four thousand, three hundred ninety-one".