20388478151 has 4 divisors (see below), whose sum is σ = 20773166472. Its totient is φ = 20003789832.

The previous prime is 20388478147. The next prime is 20388478153. The reversal of 20388478151 is 15187488302.

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 20388478151 - 2² = 20388478147 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20388478096 and 20388478105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20388478153) 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, 192344081 + ... + 192344186.

It is an arithmetic number, because the mean of its divisors is an integer number (5193291618).

Almost surely, 2^20388478151 is an apocalyptic number.

20388478151 is a deficient number, since it is larger than the sum of its proper divisors (384688321).

20388478151 is an equidigital number, since it uses as much as digits as its factorization.

20388478151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384688320.

The product of its (nonzero) digits is 430080, while the sum is 47.

The spelling of 20388478151 in words is "twenty billion, three hundred eighty-eight million, four hundred seventy-eight thousand, one hundred fifty-one".