20387774535 has 64 divisors (see below), whose sum is σ = 36469854720. Its totient is φ = 9665187840.

The previous prime is 20387774489. The next prime is 20387774587. The reversal of 20387774535 is 53547778302.

It is not a de Polignac number, because 20387774535 - 2⁹ = 20387774023 is a prime.

It is a super-2 number, since 2×20387774535² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1597339 + ... + 1610051.

It is an arithmetic number, because the mean of its divisors is an integer number (569841480).

Almost surely, 2^20387774535 is an apocalyptic number.

20387774535 is a deficient number, since it is larger than the sum of its proper divisors (16082080185).

20387774535 is a wasteful number, since it uses less digits than its factorization.

20387774535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13088.

The product of its (nonzero) digits is 4939200, while the sum is 51.

The spelling of 20387774535 in words is "twenty billion, three hundred eighty-seven million, seven hundred seventy-four thousand, five hundred thirty-five".