20515228239 has 8 divisors (see below), whose sum is σ = 29840332032. Its totient is φ = 12433471640.

The previous prime is 20515228231. The next prime is 20515228243. The reversal of 20515228239 is 93282251502.

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 20515228239 - 2³ = 20515228231 is a prime.

It is a super-2 number, since 2×20515228239² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20515228197 and 20515228206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20515228231) 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, 310836759 + ... + 310836824.

It is an arithmetic number, because the mean of its divisors is an integer number (3730041504).

Almost surely, 2^20515228239 is an apocalyptic number.

20515228239 is a deficient number, since it is larger than the sum of its proper divisors (9325103793).

20515228239 is a wasteful number, since it uses less digits than its factorization.

20515228239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621673597.

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 20515228239 in words is "twenty billion, five hundred fifteen million, two hundred twenty-eight thousand, two hundred thirty-nine".