20102818551 has 8 divisors (see below), whose sum is σ = 26817310080. Its totient is φ = 13395103032.

The previous prime is 20102818523. The next prime is 20102818573. The reversal of 20102818551 is 15581820102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20102818551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102818511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1687075 + ... + 1698948.

It is an arithmetic number, because the mean of its divisors is an integer number (3352163760).

Almost surely, 2^20102818551 is an apocalyptic number.

20102818551 is a deficient number, since it is larger than the sum of its proper divisors (6714491529).

20102818551 is a wasteful number, since it uses less digits than its factorization.

20102818551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3388005.

The product of its (nonzero) digits is 6400, while the sum is 33.

The spelling of 20102818551 in words is "twenty billion, one hundred two million, eight hundred eighteen thousand, five hundred fifty-one".