20145497 has 4 divisors (see below), whose sum is σ = 20164560. Its totient is φ = 20126436.

The previous prime is 20145487. The next prime is 20145509. The reversal of 20145497 is 79454102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20145497 - 2⁸ = 20145241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20145407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7847 + ... + 10092.

It is an arithmetic number, because the mean of its divisors is an integer number (5041140).

Almost surely, 2^20145497 is an apocalyptic number.

It is an amenable number.

20145497 is a deficient number, since it is larger than the sum of its proper divisors (19063).

20145497 is a wasteful number, since it uses less digits than its factorization.

20145497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19062.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 20145497 is about 4488.3735361487. The cubic root of 20145497 is about 272.0984045980.

Adding to 20145497 its reverse (79454102), we get a palindrome (99599599).

The spelling of 20145497 in words is "twenty million, one hundred forty-five thousand, four hundred ninety-seven".