20772245 has 16 divisors (see below), whose sum is σ = 26956272. Its totient is φ = 15275520.

The previous prime is 20772233. The next prime is 20772251. The reversal of 20772245 is 54227702.

It can be written as a sum of positive squares in 8 ways, for example, as 6195121 + 14577124 = 2489^2 + 3818^2 .

It is not a de Polignac number, because 20772245 - 2¹⁶ = 20706709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19835 + ... + 20855.

It is an arithmetic number, because the mean of its divisors is an integer number (1684767).

Almost surely, 2^20772245 is an apocalyptic number.

It is an amenable number.

20772245 is a deficient number, since it is larger than the sum of its proper divisors (6184027).

20772245 is a wasteful number, since it uses less digits than its factorization.

20772245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352.

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 20772245 is about 4557.6578414795. The cubic root of 20772245 is about 274.8913951312.

Adding to 20772245 its reverse (54227702), we get a palindrome (74999947).

It can be divided in two parts, 20 and 772245, that multiplied together give a square (15444900 = 3930²).

The spelling of 20772245 in words is "twenty million, seven hundred seventy-two thousand, two hundred forty-five".