20554187261 has 8 divisors (see below), whose sum is σ = 20595294720. Its totient is φ = 20513104848.

The previous prime is 20554187249. The next prime is 20554187279. The reversal of 20554187261 is 16278145502.

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

It is a cyclic number.

It is not a de Polignac number, because 20554187261 - 2⁶ = 20554187197 is a prime.

It is a super-2 number, since 2×20554187261² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20554387261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2836535 + ... + 2843771.

It is an arithmetic number, because the mean of its divisors is an integer number (2574411840).

Almost surely, 2^20554187261 is an apocalyptic number.

It is an amenable number.

20554187261 is a deficient number, since it is larger than the sum of its proper divisors (41107459).

20554187261 is an equidigital number, since it uses as much as digits as its factorization.

20554187261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12523.

The product of its (nonzero) digits is 134400, while the sum is 41.

The spelling of 20554187261 in words is "twenty billion, five hundred fifty-four million, one hundred eighty-seven thousand, two hundred sixty-one".