20861333405 has 16 divisors (see below), whose sum is σ = 27312422400. Its totient is φ = 15170189760.

The previous prime is 20861333371. The next prime is 20861333413. The reversal of 20861333405 is 50433316802.

It is not a de Polignac number, because 20861333405 - 2⁸ = 20861333149 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 (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 698111 + ... + 727379.

It is an arithmetic number, because the mean of its divisors is an integer number (1707026400).

Almost surely, 2^20861333405 is an apocalyptic number.

It is an amenable number.

20861333405 is a deficient number, since it is larger than the sum of its proper divisors (6451088995).

20861333405 is a wasteful number, since it uses less digits than its factorization.

20861333405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42244.

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 20861333405 in words is "twenty billion, eight hundred sixty-one million, three hundred thirty-three thousand, four hundred five".