20687681926 has 16 divisors (see below), whose sum is σ = 31770140688. Its totient is φ = 10097892000.

The previous prime is 20687681921. The next prime is 20687681941. The reversal of 20687681926 is 62918678602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20687681921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100216 + ... + 226756.

It is an arithmetic number, because the mean of its divisors is an integer number (1985633793).

Almost surely, 2^20687681926 is an apocalyptic number.

20687681926 is a deficient number, since it is larger than the sum of its proper divisors (11082458762).

20687681926 is a wasteful number, since it uses less digits than its factorization.

20687681926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128487.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 20687681926 in words is "twenty billion, six hundred eighty-seven million, six hundred eighty-one thousand, nine hundred twenty-six".