20993439902 has 16 divisors (see below), whose sum is σ = 31793228352. Its totient is φ = 10395840000.

The previous prime is 20993439899. The next prime is 20993439917.

20993439902 is nontrivially palindromic in base 10.

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 7 ways as a sum of consecutive naturals, for example, 264902 + ... + 334902.

It is an arithmetic number, because the mean of its divisors is an integer number (1987076772).

Almost surely, 2^20993439902 is an apocalyptic number.

20993439902 is a deficient number, since it is larger than the sum of its proper divisors (10799788450).

20993439902 is a wasteful number, since it uses less digits than its factorization.

20993439902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71443.

The product of its (nonzero) digits is 944784, while the sum is 50.

The spelling of 20993439902 in words is "twenty billion, nine hundred ninety-three million, four hundred thirty-nine thousand, nine hundred two".