20955898547 has 4 divisors (see below), whose sum is σ = 21012999456. Its totient is φ = 20898797640.

The previous prime is 20955898541. The next prime is 20955898549. The reversal of 20955898547 is 74589855902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20955898547 - 2⁸ = 20955898291 is a prime.

It is a super-2 number, since 2×20955898547² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20955898547.

It is not an unprimeable number, because it can be changed into a prime (20955898541) 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, 28549904 + ... + 28550637.

It is an arithmetic number, because the mean of its divisors is an integer number (5253249864).

Almost surely, 2^20955898547 is an apocalyptic number.

20955898547 is a deficient number, since it is larger than the sum of its proper divisors (57100909).

20955898547 is an equidigital number, since it uses as much as digits as its factorization.

20955898547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57100908.

The product of its (nonzero) digits is 36288000, while the sum is 62.

The spelling of 20955898547 in words is "twenty billion, nine hundred fifty-five million, eight hundred ninety-eight thousand, five hundred forty-seven".