20894687943 has 16 divisors (see below), whose sum is σ = 27966382080. Its totient is φ = 13876483104.

The previous prime is 20894687911. The next prime is 20894687951. The reversal of 20894687943 is 34978649802.

It is not a de Polignac number, because 20894687943 - 2⁵ = 20894687911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20894687243) 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, 969438 + ... + 990756.

It is an arithmetic number, because the mean of its divisors is an integer number (1747898880).

Almost surely, 2^20894687943 is an apocalyptic number.

20894687943 is a deficient number, since it is larger than the sum of its proper divisors (7071694137).

20894687943 is a wasteful number, since it uses less digits than its factorization.

20894687943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22558.

The product of its (nonzero) digits is 20901888, while the sum is 60.

The spelling of 20894687943 in words is "twenty billion, eight hundred ninety-four million, six hundred eighty-seven thousand, nine hundred forty-three".