20685052405 has 8 divisors (see below), whose sum is σ = 25622774784. Its totient is φ = 16014234000.

The previous prime is 20685052351. The next prime is 20685052439. The reversal of 20685052405 is 50425058602.

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

It is not a de Polignac number, because 20685052405 - 2²¹ = 20682955253 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 66725821 + ... + 66726130.

It is an arithmetic number, because the mean of its divisors is an integer number (3202846848).

Almost surely, 2^20685052405 is an apocalyptic number.

It is an amenable number.

20685052405 is a deficient number, since it is larger than the sum of its proper divisors (4937722379).

20685052405 is a wasteful number, since it uses less digits than its factorization.

20685052405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133451987.

The product of its (nonzero) digits is 96000, while the sum is 37.

The spelling of 20685052405 in words is "twenty billion, six hundred eighty-five million, fifty-two thousand, four hundred five".