20949229815 has 32 divisors (see below), whose sum is σ = 34767817920. Its totient is φ = 10758644736.

The previous prime is 20949229799. The next prime is 20949229883. The reversal of 20949229815 is 51892294902.

It is not a de Polignac number, because 20949229815 - 2⁴ = 20949229799 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97699 + ... + 226811.

It is an arithmetic number, because the mean of its divisors is an integer number (1086494310).

Almost surely, 2^20949229815 is an apocalyptic number.

20949229815 is a deficient number, since it is larger than the sum of its proper divisors (13818588105).

20949229815 is a wasteful number, since it uses less digits than its factorization.

20949229815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129523.

The product of its (nonzero) digits is 933120, while the sum is 51.

The spelling of 20949229815 in words is "twenty billion, nine hundred forty-nine million, two hundred twenty-nine thousand, eight hundred fifteen".