20743234257 has 8 divisors (see below), whose sum is σ = 27931484160. Its totient is φ = 13691903600.

The previous prime is 20743234247. The next prime is 20743234279. The reversal of 20743234257 is 75243234702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20743234257 - 2¹² = 20743230161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20743234247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34229457 + ... + 34230062.

It is an arithmetic number, because the mean of its divisors is an integer number (3491435520).

Almost surely, 2^20743234257 is an apocalyptic number.

It is an amenable number.

20743234257 is a deficient number, since it is larger than the sum of its proper divisors (7188249903).

20743234257 is a wasteful number, since it uses less digits than its factorization.

20743234257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68459623.

The product of its (nonzero) digits is 282240, while the sum is 39.

Adding to 20743234257 its reverse (75243234702), we get a palindrome (95986468959).

The spelling of 20743234257 in words is "twenty billion, seven hundred forty-three million, two hundred thirty-four thousand, two hundred fifty-seven".