20772193 has 4 divisors (see below), whose sum is σ = 22370068. Its totient is φ = 19174320.

The previous prime is 20772173. The next prime is 20772203. The reversal of 20772193 is 39127702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7573504 + 13198689 = 2752^2 + 3633^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20772193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20772173) 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, 798918 + ... + 798943.

It is an arithmetic number, because the mean of its divisors is an integer number (5592517).

Almost surely, 2^20772193 is an apocalyptic number.

It is an amenable number.

20772193 is a deficient number, since it is larger than the sum of its proper divisors (1597875).

20772193 is a wasteful number, since it uses less digits than its factorization.

20772193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597874.

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

The square root of 20772193 is about 4557.6521367915. The cubic root of 20772193 is about 274.8911657488.

Adding to 20772193 its reverse (39127702), we get a palindrome (59899895).

The spelling of 20772193 in words is "twenty million, seven hundred seventy-two thousand, one hundred ninety-three".