20164645 has 16 divisors (see below), whose sum is σ = 25194240. Its totient is φ = 15481024.

The previous prime is 20164631. The next prime is 20164649. The reversal of 20164645 is 54646102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20164645 is a prime.

It is a super-2 number, since 2×20164645² = 813225815952050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20164649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11646 + ... + 13264.

It is an arithmetic number, because the mean of its divisors is an integer number (1574640).

Almost surely, 2^20164645 is an apocalyptic number.

It is an amenable number.

20164645 is a deficient number, since it is larger than the sum of its proper divisors (5029595).

20164645 is a wasteful number, since it uses less digits than its factorization.

20164645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20164645 is about 4490.5060961990. The cubic root of 20164645 is about 272.1845858159.

It can be divided in two parts, 201 and 64645, that added together give a palindrome (64846).

The spelling of 20164645 in words is "twenty million, one hundred sixty-four thousand, six hundred forty-five".