20551505635 has 16 divisors (see below), whose sum is σ = 25281305280. Its totient is φ = 16028776960.

The previous prime is 20551505599. The next prime is 20551505677. The reversal of 20551505635 is 53650515502.

It is not a de Polignac number, because 20551505635 - 2²³ = 20543117027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20551505594 and 20551505603.

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 15 ways as a sum of consecutive naturals, for example, 258786 + ... + 328744.

It is an arithmetic number, because the mean of its divisors is an integer number (1580081580).

Almost surely, 2^20551505635 is an apocalyptic number.

20551505635 is a deficient number, since it is larger than the sum of its proper divisors (4729799645).

20551505635 is a wasteful number, since it uses less digits than its factorization.

20551505635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71438.

The product of its (nonzero) digits is 112500, while the sum is 37.

The spelling of 20551505635 in words is "twenty billion, five hundred fifty-one million, five hundred five thousand, six hundred thirty-five".