20516667 has 16 divisors (see below), whose sum is σ = 28654080. Its totient is φ = 13033152.

The previous prime is 20516609. The next prime is 20516681. The reversal of 20516667 is 76661502.

It is not a de Polignac number, because 20516667 - 2¹¹ = 20514619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20516267) 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, 27858 + ... + 28584.

It is an arithmetic number, because the mean of its divisors is an integer number (1790880).

Almost surely, 2^20516667 is an apocalyptic number.

20516667 is a deficient number, since it is larger than the sum of its proper divisors (8137413).

20516667 is a wasteful number, since it uses less digits than its factorization.

20516667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20516667 is about 4529.5327573603. The cubic root of 20516667 is about 273.7593345580.

The spelling of 20516667 in words is "twenty million, five hundred sixteen thousand, six hundred sixty-seven".