20355055406 has 48 divisors (see below), whose sum is σ = 36432562320. Its totient is φ = 8499415680.

The previous prime is 20355055387. The next prime is 20355055423. The reversal of 20355055406 is 60455055302.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3424385 + ... + 3430323.

It is an arithmetic number, because the mean of its divisors is an integer number (759011715).

Almost surely, 2^20355055406 is an apocalyptic number.

20355055406 is a deficient number, since it is larger than the sum of its proper divisors (16077506914).

20355055406 is a wasteful number, since it uses less digits than its factorization.

20355055406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6849 (or 6842 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 35.

The spelling of 20355055406 in words is "twenty billion, three hundred fifty-five million, fifty-five thousand, four hundred six".