20501167 has 4 divisors (see below), whose sum is σ = 21707136. Its totient is φ = 19295200.

The previous prime is 20501141. The next prime is 20501183. The reversal of 20501167 is 76110502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20501167 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 (20501197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 602959 + ... + 602992.

It is an arithmetic number, because the mean of its divisors is an integer number (5426784).

Almost surely, 2^20501167 is an apocalyptic number.

20501167 is a deficient number, since it is larger than the sum of its proper divisors (1205969).

20501167 is a wasteful number, since it uses less digits than its factorization.

20501167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205968.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 20501167 is about 4527.8214408256. The cubic root of 20501167 is about 273.6903769846.

Adding to 20501167 its reverse (76110502), we get a palindrome (96611669).

The spelling of 20501167 in words is "twenty million, five hundred one thousand, one hundred sixty-seven".