20772391 has 8 divisors (see below), whose sum is σ = 21186144. Its totient is φ = 20361120.

The previous prime is 20772383. The next prime is 20772403. The reversal of 20772391 is 19327702.

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 20772391 - 2³ = 20772383 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 (20772341) 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, 30345 + ... + 31021.

It is an arithmetic number, because the mean of its divisors is an integer number (2648268).

Almost surely, 2^20772391 is an apocalyptic number.

20772391 is a deficient number, since it is larger than the sum of its proper divisors (413753).

20772391 is an equidigital number, since it uses as much as digits as its factorization.

20772391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 20772391 is about 4557.6738584502. The cubic root of 20772391 is about 274.8920391645.

The spelling of 20772391 in words is "twenty million, seven hundred seventy-two thousand, three hundred ninety-one".