20555555535 has 36 divisors (see below), whose sum is σ = 36618728328. Its totient is φ = 10666634688.

The previous prime is 20555555519. The next prime is 20555555539. The reversal of 20555555535 is 53555555502.

It is not a de Polignac number, because 20555555535 - 2⁴ = 20555555519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555555539) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 105229 + ... + 228438.

It is an arithmetic number, because the mean of its divisors is an integer number (1017186898).

Almost surely, 2^20555555535 is an apocalyptic number.

20555555535 is a deficient number, since it is larger than the sum of its proper divisors (16063172793).

20555555535 is a wasteful number, since it uses less digits than its factorization.

20555555535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333752 (or 333712 counting only the distinct ones).

The product of its (nonzero) digits is 2343750, while the sum is 45.

It can be divided in two parts, 20 and 555555535, that added together give a palindrome (555555555).

The spelling of 20555555535 in words is "twenty billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred thirty-five".