20992017 has 16 divisors (see below), whose sum is σ = 29597760. Its totient is φ = 13197312.

The previous prime is 20992007. The next prime is 20992019. The reversal of 20992017 is 71029902.

20992017 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 20992017 - 2¹² = 20987921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20992019) 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, 13933 + ... + 15365.

It is an arithmetic number, because the mean of its divisors is an integer number (1849860).

Almost surely, 2^20992017 is an apocalyptic number.

It is an amenable number.

20992017 is a deficient number, since it is larger than the sum of its proper divisors (8605743).

20992017 is a wasteful number, since it uses less digits than its factorization.

20992017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 20992017 is about 4581.7045954535. The cubic root of 20992017 is about 275.8574536967.

The spelling of 20992017 in words is "twenty million, nine hundred ninety-two thousand, seventeen".