20764391 has 8 divisors (see below), whose sum is σ = 21083040. Its totient is φ = 20448288.

The previous prime is 20764369. The next prime is 20764421. The reversal of 20764391 is 19346702.

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 20764391 - 2¹⁸ = 20502247 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 (20764301) 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, 20990 + ... + 21956.

It is an arithmetic number, because the mean of its divisors is an integer number (2635380).

Almost surely, 2^20764391 is an apocalyptic number.

20764391 is a deficient number, since it is larger than the sum of its proper divisors (318649).

20764391 is a wasteful number, since it uses less digits than its factorization.

20764391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20764391 is about 4556.7961332498. The cubic root of 20764391 is about 274.8567452225.

The spelling of 20764391 in words is "twenty million, seven hundred sixty-four thousand, three hundred ninety-one".