20685026438 has 32 divisors (see below), whose sum is σ = 33081834240. Its totient is φ = 9671991840.

The previous prime is 20685026431. The next prime is 20685026443. The reversal of 20685026438 is 83462058602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20685026431) 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, 5489231 + ... + 5492997.

It is an arithmetic number, because the mean of its divisors is an integer number (1033807320).

Almost surely, 2^20685026438 is an apocalyptic number.

20685026438 is a deficient number, since it is larger than the sum of its proper divisors (12396807802).

20685026438 is a wasteful number, since it uses less digits than its factorization.

20685026438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5612.

The product of its (nonzero) digits is 552960, while the sum is 44.

The spelling of 20685026438 in words is "twenty billion, six hundred eighty-five million, twenty-six thousand, four hundred thirty-eight".