20261656210 has 64 divisors (see below), whose sum is σ = 39728804832. Its totient is φ = 7408889856.

The previous prime is 20261656187. The next prime is 20261656223. The reversal of 20261656210 is 1265616202.

It can be written as a sum of positive squares in 16 ways, for example, as 3986785881 + 16274870329 = 63141^2 + 127573^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4104904 + ... + 4109836.

Almost surely, 2^20261656210 is an apocalyptic number.

20261656210 is a deficient number, since it is larger than the sum of its proper divisors (19467148622).

20261656210 is a wasteful number, since it uses less digits than its factorization.

20261656210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5647.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 20261656210 in words is "twenty billion, two hundred sixty-one million, six hundred fifty-six thousand, two hundred ten".