20861324407 has 16 divisors (see below), whose sum is σ = 26033356800. Its totient is φ = 16240307040.

The previous prime is 20861324399. The next prime is 20861324437. The reversal of 20861324407 is 70442316802.

It is a cyclic number.

It is not a de Polignac number, because 20861324407 - 2³ = 20861324399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20861324437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44407 + ... + 209032.

It is an arithmetic number, because the mean of its divisors is an integer number (1627084800).

Almost surely, 2^20861324407 is an apocalyptic number.

20861324407 is a deficient number, since it is larger than the sum of its proper divisors (5172032393).

20861324407 is a wasteful number, since it uses less digits than its factorization.

20861324407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254526.

The product of its (nonzero) digits is 64512, while the sum is 37.

The spelling of 20861324407 in words is "twenty billion, eight hundred sixty-one million, three hundred twenty-four thousand, four hundred seven".