20948155815 has 8 divisors (see below), whose sum is σ = 33517049328. Its totient is φ = 11172349760.

The previous prime is 20948155807. The next prime is 20948155883. The reversal of 20948155815 is 51855184902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20948155815 - 2³ = 20948155807 is a prime.

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, 698271846 + ... + 698271875.

It is an arithmetic number, because the mean of its divisors is an integer number (4189631166).

Almost surely, 2^20948155815 is an apocalyptic number.

20948155815 is a deficient number, since it is larger than the sum of its proper divisors (12568893513).

20948155815 is a wasteful number, since it uses less digits than its factorization.

20948155815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396543729.

The product of its (nonzero) digits is 576000, while the sum is 48.

The spelling of 20948155815 in words is "twenty billion, nine hundred forty-eight million, one hundred fifty-five thousand, eight hundred fifteen".