20636645426 has 16 divisors (see below), whose sum is σ = 31275927360. Its totient is φ = 10211845200.

The previous prime is 20636645377. The next prime is 20636645459. The reversal of 20636645426 is 62454663602.

20636645426 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×20636645426² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45776 + ... + 208251.

It is an arithmetic number, because the mean of its divisors is an integer number (1954745460).

Almost surely, 2^20636645426 is an apocalyptic number.

20636645426 is a deficient number, since it is larger than the sum of its proper divisors (10639281934).

20636645426 is a wasteful number, since it uses less digits than its factorization.

20636645426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254449.

The product of its (nonzero) digits is 1244160, while the sum is 44.

The spelling of 20636645426 in words is "twenty billion, six hundred thirty-six million, six hundred forty-five thousand, four hundred twenty-six".