20297445 has 32 divisors (see below), whose sum is σ = 37735680. Its totient is φ = 9123840.

The previous prime is 20297437. The next prime is 20297447. The reversal of 20297445 is 54479202.

It is not a de Polignac number, because 20297445 - 2³ = 20297437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20297447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4821 + ... + 7989.

It is an arithmetic number, because the mean of its divisors is an integer number (1179240).

Almost surely, 2^20297445 is an apocalyptic number.

It is an amenable number.

20297445 is a deficient number, since it is larger than the sum of its proper divisors (17438235).

20297445 is a wasteful number, since it uses less digits than its factorization.

20297445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3245.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 20297445 is about 4505.2685824488. The cubic root of 20297445 is about 272.7807952026.

The spelling of 20297445 in words is "twenty million, two hundred ninety-seven thousand, four hundred forty-five".