20156138495 has 8 divisors (see below), whose sum is σ = 24422195616. Its totient is φ = 15968357856.

The previous prime is 20156138449. The next prime is 20156138503. The reversal of 20156138495 is 59483165102.

It is a happy number.

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 20156138495 - 2¹⁰ = 20156137471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19568552 + ... + 19569581.

It is an arithmetic number, because the mean of its divisors is an integer number (3052774452).

Almost surely, 2^20156138495 is an apocalyptic number.

20156138495 is a deficient number, since it is larger than the sum of its proper divisors (4266057121).

20156138495 is a wasteful number, since it uses less digits than its factorization.

20156138495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39138241.

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 20156138495 in words is "twenty billion, one hundred fifty-six million, one hundred thirty-eight thousand, four hundred ninety-five".