20810686406 has 8 divisors (see below), whose sum is σ = 31218296184. Its totient is φ = 10404587680.

The previous prime is 20810686361. The next prime is 20810686409. The reversal of 20810686406 is 60468601802.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20810686409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342680 + ... + 398811.

It is an arithmetic number, because the mean of its divisors is an integer number (3902287023).

Almost surely, 2^20810686406 is an apocalyptic number.

20810686406 is a deficient number, since it is larger than the sum of its proper divisors (10407609778).

20810686406 is a wasteful number, since it uses less digits than its factorization.

20810686406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755526.

The product of its (nonzero) digits is 110592, while the sum is 41.

The spelling of 20810686406 in words is "twenty billion, eight hundred ten million, six hundred eighty-six thousand, four hundred six".