20861814730 has 16 divisors (see below), whose sum is σ = 37553753160. Its totient is φ = 8344173312.

The previous prime is 20861814719. The next prime is 20861814749. The reversal of 20861814730 is 3741816802.

It can be written as a sum of positive squares in 4 ways, for example, as 12943840441 + 7917974289 = 113771^2 + 88983^2 .

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, 112126 + ... + 233014.

Almost surely, 2^20861814730 is an apocalyptic number.

20861814730 is a deficient number, since it is larger than the sum of its proper divisors (16691938430).

20861814730 is a wasteful number, since it uses less digits than its factorization.

20861814730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138153.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 20861814730 in words is "twenty billion, eight hundred sixty-one million, eight hundred fourteen thousand, seven hundred thirty".