20545497 has 12 divisors (see below), whose sum is σ = 33916480. Its totient is φ = 11740248.

The previous prime is 20545493. The next prime is 20545531. The reversal of 20545497 is 79454502.

20545497 is a `hidden beast` number, since 20 + 545 + 4 + 97 = 666.

It is not a de Polignac number, because 20545497 - 2² = 20545493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20545493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162997 + ... + 163122.

Almost surely, 2^20545497 is an apocalyptic number.

It is an amenable number.

20545497 is a deficient number, since it is larger than the sum of its proper divisors (13370983).

20545497 is a wasteful number, since it uses less digits than its factorization.

20545497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326132 (or 326129 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 20545497 is about 4532.7140876080. The cubic root of 20545497 is about 273.8875033237.

Adding to 20545497 its reverse (79454502), we get a palindrome (99999999).

The spelling of 20545497 in words is "twenty million, five hundred forty-five thousand, four hundred ninety-seven".