20772297 has 36 divisors (see below), whose sum is σ = 37150464. Its totient is φ = 10951200.

The previous prime is 20772293. The next prime is 20772313. The reversal of 20772297 is 79227702.

It is not a de Polignac number, because 20772297 - 2² = 20772293 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20772293) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9672 + ... + 11622.

Almost surely, 2^20772297 is an apocalyptic number.

It is an amenable number.

20772297 is a deficient number, since it is larger than the sum of its proper divisors (16378167).

20772297 is a wasteful number, since it uses less digits than its factorization.

20772297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990 (or 1974 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 20772297 is about 4557.6635461605. The cubic root of 20772297 is about 274.8916245133.

Adding to 20772297 its reverse (79227702), we get a palindrome (99999999).

The spelling of 20772297 in words is "twenty million, seven hundred seventy-two thousand, two hundred ninety-seven".