20907143 has 4 divisors (see below), whose sum is σ = 20969520. Its totient is φ = 20844768.

The previous prime is 20907137. The next prime is 20907167. The reversal of 20907143 is 34170902.

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

It is a cyclic number.

It is not a de Polignac number, because 20907143 - 2²⁴ = 4129927 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 (20907193) 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, 30683 + ... + 31356.

It is an arithmetic number, because the mean of its divisors is an integer number (5242380).

Almost surely, 2^20907143 is an apocalyptic number.

20907143 is a deficient number, since it is larger than the sum of its proper divisors (62377).

20907143 is an equidigital number, since it uses as much as digits as its factorization.

20907143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62376.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20907143 is about 4572.4329410064. The cubic root of 20907143 is about 275.4851732737.

The spelling of 20907143 in words is "twenty million, nine hundred seven thousand, one hundred forty-three".