20278136471 has 2 divisors, whose sum is σ = 20278136472. Its totient is φ = 20278136470.

The previous prime is 20278136453. The next prime is 20278136477. The reversal of 20278136471 is 17463187202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20278136471 is a prime.

It is a super-3 number, since 3×20278136471³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20278136477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10139068235 + 10139068236.

It is an arithmetic number, because the mean of its divisors is an integer number (10139068236).

Almost surely, 2^20278136471 is an apocalyptic number.

20278136471 is a deficient number, since it is larger than the sum of its proper divisors (1).

20278136471 is an equidigital number, since it uses as much as digits as its factorization.

20278136471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 20278136471 in words is "twenty billion, two hundred seventy-eight million, one hundred thirty-six thousand, four hundred seventy-one".