20555309495 has 16 divisors (see below), whose sum is σ = 28246656000. Its totient is φ = 14066810784.

The previous prime is 20555309491. The next prime is 20555309497. The reversal of 20555309495 is 59490355502.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20555309495 - 2² = 20555309491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555309491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 571007 + ... + 605936.

It is an arithmetic number, because the mean of its divisors is an integer number (1765416000).

Almost surely, 2^20555309495 is an apocalyptic number.

20555309495 is a deficient number, since it is larger than the sum of its proper divisors (7691346505).

20555309495 is a wasteful number, since it uses less digits than its factorization.

20555309495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177454.

The product of its (nonzero) digits is 1215000, while the sum is 47.

The spelling of 20555309495 in words is "twenty billion, five hundred fifty-five million, three hundred nine thousand, four hundred ninety-five".