20772194 has 4 divisors (see below), whose sum is σ = 31158294. Its totient is φ = 10386096.

The previous prime is 20772173. The next prime is 20772203. The reversal of 20772194 is 49127702.

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

It can be written as a sum of positive squares in only one way, i.e., 16507969 + 4264225 = 4063^2 + 2065^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20772194.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5193047 + ... + 5193050.

Almost surely, 2^20772194 is an apocalyptic number.

20772194 is a deficient number, since it is larger than the sum of its proper divisors (10386100).

20772194 is a wasteful number, since it uses less digits than its factorization.

20772194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10386099.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 20772194 is about 4557.6522464971. The cubic root of 20772194 is about 274.8911701600.

Adding to 20772194 its reverse (49127702), we get a palindrome (69899896).

The spelling of 20772194 in words is "twenty million, seven hundred seventy-two thousand, one hundred ninety-four".