20364785 has 16 divisors (see below), whose sum is σ = 28017792. Its totient is φ = 13920000.

The previous prime is 20364769. The next prime is 20364787. The reversal of 20364785 is 58746302.

It is a happy number.

It is not a de Polignac number, because 20364785 - 2⁴ = 20364769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20364787) 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, 13310 + ... + 14760.

It is an arithmetic number, because the mean of its divisors is an integer number (1751112).

Almost surely, 2^20364785 is an apocalyptic number.

It is an amenable number.

20364785 is a deficient number, since it is larger than the sum of its proper divisors (7653007).

20364785 is a wasteful number, since it uses less digits than its factorization.

20364785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20364785 is about 4512.7358664119. The cubic root of 20364785 is about 273.0821267580.

The spelling of 20364785 in words is "twenty million, three hundred sixty-four thousand, seven hundred eighty-five".