20505067 has 16 divisors (see below), whose sum is σ = 23288832. Its totient is φ = 17889120.

The previous prime is 20505049. The next prime is 20505083. The reversal of 20505067 is 76050502.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20505067 - 2¹⁵ = 20472299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20505007) 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, 33478 + ... + 34084.

It is an arithmetic number, because the mean of its divisors is an integer number (1455552).

Almost surely, 2^20505067 is an apocalyptic number.

20505067 is a deficient number, since it is larger than the sum of its proper divisors (2783765).

20505067 is a wasteful number, since it uses less digits than its factorization.

20505067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 20505067 is about 4528.2520910391. The cubic root of 20505067 is about 273.7077308714.

Adding to 20505067 its reverse (76050502), we get a palindrome (96555569).

It can be divided in two parts, 2050 and 5067, that added together give a palindrome (7117).

The spelling of 20505067 in words is "twenty million, five hundred five thousand, sixty-seven".