20380555471 has 4 divisors (see below), whose sum is σ = 20383248600. Its totient is φ = 20377862344.

The previous prime is 20380555421. The next prime is 20380555483. The reversal of 20380555471 is 17455508302.

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 20380555471 - 2⁷ = 20380555343 is a prime.

It is a super-3 number, since 3×20380555471³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20380555421) 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, 1335181 + ... + 1350358.

It is an arithmetic number, because the mean of its divisors is an integer number (5095812150).

Almost surely, 2^20380555471 is an apocalyptic number.

20380555471 is a deficient number, since it is larger than the sum of its proper divisors (2693129).

20380555471 is an equidigital number, since it uses as much as digits as its factorization.

20380555471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2693128.

The product of its (nonzero) digits is 168000, while the sum is 40.

The spelling of 20380555471 in words is "twenty billion, three hundred eighty million, five hundred fifty-five thousand, four hundred seventy-one".