20740751 has 8 divisors (see below), whose sum is σ = 21035520. Its totient is φ = 20448288.

The previous prime is 20740747. The next prime is 20740777. The reversal of 20740751 is 15704702.

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 20740751 - 2² = 20740747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20740751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20740781) 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, 24605 + ... + 25433.

It is an arithmetic number, because the mean of its divisors is an integer number (2629440).

Almost surely, 2^20740751 is an apocalyptic number.

20740751 is a deficient number, since it is larger than the sum of its proper divisors (294769).

20740751 is a wasteful number, since it uses less digits than its factorization.

20740751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 20740751 is about 4554.2014667777. The cubic root of 20740751 is about 274.7523986220.

The spelling of 20740751 in words is "twenty million, seven hundred forty thousand, seven hundred fifty-one".