20992143 has 16 divisors (see below), whose sum is σ = 29253600. Its totient is φ = 13372800.

The previous prime is 20992133. The next prime is 20992151. The reversal of 20992143 is 34129902.

It is not a de Polignac number, because 20992143 - 2¹³ = 20983951 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20992143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20992133) 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, 7593 + ... + 9981.

It is an arithmetic number, because the mean of its divisors is an integer number (1828350).

Almost surely, 2^20992143 is an apocalyptic number.

20992143 is a deficient number, since it is larger than the sum of its proper divisors (8261457).

20992143 is a wasteful number, since it uses less digits than its factorization.

20992143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 20992143 is about 4581.7183457738. The cubic root of 20992143 is about 275.8580056203.

The spelling of 20992143 in words is "twenty million, nine hundred ninety-two thousand, one hundred forty-three".