20671638426 has 32 divisors (see below), whose sum is σ = 47418816000. Its totient is φ = 6668269920.

The previous prime is 20671638419. The next prime is 20671638433. The reversal of 20671638426 is 62483617602.

20671638426 is a `hidden beast` number, since 2 + 0 + 6 + 7 + 1 + 638 + 4 + 2 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (20671638419) and next prime (20671638433).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6172651 + ... + 6175998.

It is an arithmetic number, because the mean of its divisors is an integer number (1481838000).

Almost surely, 2^20671638426 is an apocalyptic number.

20671638426 is an abundant number, since it is smaller than the sum of its proper divisors (26747177574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20671638426 is a wasteful number, since it uses less digits than its factorization.

20671638426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12348691 (or 12348685 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 20671638426 in words is "twenty billion, six hundred seventy-one million, six hundred thirty-eight thousand, four hundred twenty-six".