20535502405 has 16 divisors (see below), whose sum is σ = 26901471168. Its totient is φ = 14924560000.

The previous prime is 20535502399. The next prime is 20535502411. The reversal of 20535502405 is 50420553502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20535502399) and next prime (20535502411).

It is not a de Polignac number, because 20535502405 - 2³ = 20535502397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48856 + ... + 208465.

It is an arithmetic number, because the mean of its divisors is an integer number (1681341948).

Almost surely, 2^20535502405 is an apocalyptic number.

It is an amenable number.

20535502405 is a deficient number, since it is larger than the sum of its proper divisors (6365968763).

20535502405 is a wasteful number, since it uses less digits than its factorization.

20535502405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258788.

The product of its (nonzero) digits is 30000, while the sum is 31.

The spelling of 20535502405 in words is "twenty billion, five hundred thirty-five million, five hundred two thousand, four hundred five".