20734751 has 4 divisors (see below), whose sum is σ = 20752104. Its totient is φ = 20717400.

The previous prime is 20734733. The next prime is 20734771. The reversal of 20734751 is 15743702.

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

It is a cyclic number.

It is not a de Polignac number, because 20734751 - 2⁶ = 20734687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20734771) 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, 6740 + ... + 9321.

It is an arithmetic number, because the mean of its divisors is an integer number (5188026).

Almost surely, 2^20734751 is an apocalyptic number.

20734751 is a deficient number, since it is larger than the sum of its proper divisors (17353).

20734751 is a wasteful number, since it uses less digits than its factorization.

20734751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17352.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 20734751 is about 4553.5426867440. The cubic root of 20734751 is about 274.7259020986.

The spelling of 20734751 in words is "twenty million, seven hundred thirty-four thousand, seven hundred fifty-one".