20551477831086 has 32 divisors (see below), whose sum is σ = 41995136517120. Its totient is φ = 6702515884064.

The previous prime is 20551477831081. The next prime is 20551477831123. The reversal of 20551477831086 is 68013877415502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551477831081) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 89895990 + ... + 90124313.

It is an arithmetic number, because the mean of its divisors is an integer number (1312348016160).

Almost surely, 2^{20551477831086} is an apocalyptic number.

20551477831086 is an abundant number, since it is smaller than the sum of its proper divisors (21443658686034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20551477831086 is a wasteful number, since it uses less digits than its factorization.

20551477831086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180020720.

The product of its (nonzero) digits is 11289600, while the sum is 57.

The spelling of 20551477831086 in words is "twenty trillion, five hundred fifty-one billion, four hundred seventy-seven million, eight hundred thirty-one thousand, eighty-six".