20587235406 has 8 divisors (see below), whose sum is σ = 41174470824. Its totient is φ = 6862411800.

The previous prime is 20587235381. The next prime is 20587235419. The reversal of 20587235406 is 60453278502.

It is a sphenic number, since it is the product of 3 distinct primes.

20587235406 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1715602945 + ... + 1715602956.

It is an arithmetic number, because the mean of its divisors is an integer number (5146808853).

Almost surely, 2^20587235406 is an apocalyptic number.

20587235406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20587235406 is a wasteful number, since it uses less digits than its factorization.

20587235406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3431205906.

The product of its (nonzero) digits is 403200, while the sum is 42.

The spelling of 20587235406 in words is "twenty billion, five hundred eighty-seven million, two hundred thirty-five thousand, four hundred six".