20915464239 has 6 divisors (see below), whose sum is σ = 30211226136. Its totient is φ = 13943642820.

The previous prime is 20915464189. The next prime is 20915464249. The reversal of 20915464239 is 93246451902.

20915464239 is a `hidden beast` number, since 209 + 15 + 4 + 6 + 423 + 9 = 666.

It is not a de Polignac number, because 20915464239 - 2¹³ = 20915456047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20915464194 and 20915464203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20915464249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1161970227 + ... + 1161970244.

It is an arithmetic number, because the mean of its divisors is an integer number (5035204356).

Almost surely, 2^20915464239 is an apocalyptic number.

20915464239 is a deficient number, since it is larger than the sum of its proper divisors (9295761897).

20915464239 is a wasteful number, since it uses less digits than its factorization.

20915464239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323940477 (or 2323940474 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 20915464239 in words is "twenty billion, nine hundred fifteen million, four hundred sixty-four thousand, two hundred thirty-nine".