20345087 has 16 divisors (see below), whose sum is σ = 24509952. Its totient is φ = 16510560.

The previous prime is 20345077. The next prime is 20345093. The reversal of 20345087 is 78054302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20345087 - 2⁶ = 20345023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16637 + ... + 17817.

It is an arithmetic number, because the mean of its divisors is an integer number (1531872).

Almost surely, 2^20345087 is an apocalyptic number.

20345087 is a deficient number, since it is larger than the sum of its proper divisors (4164865).

20345087 is a wasteful number, since it uses less digits than its factorization.

20345087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20345087 is about 4510.5528485985. The cubic root of 20345087 is about 272.9940514029.

Adding to 20345087 its reverse (78054302), we get a palindrome (98399389).

The spelling of 20345087 in words is "twenty million, three hundred forty-five thousand, eighty-seven".