20210505105 has 64 divisors (see below), whose sum is σ = 39635619840. Its totient is φ = 8587627776.

The previous prime is 20210505089. The next prime is 20210505113. The reversal of 20210505105 is 50150501202.

It is not a de Polignac number, because 20210505105 - 2⁴ = 20210505089 is a prime.

It is a super-2 number, since 2×20210505105² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 10164 + ... + 201306.

It is an arithmetic number, because the mean of its divisors is an integer number (619306560).

Almost surely, 2^20210505105 is an apocalyptic number.

It is an amenable number.

20210505105 is a deficient number, since it is larger than the sum of its proper divisors (19425114735).

20210505105 is a wasteful number, since it uses less digits than its factorization.

20210505105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191230.

The product of its (nonzero) digits is 500, while the sum is 21.

The spelling of 20210505105 in words is "twenty billion, two hundred ten million, five hundred five thousand, one hundred five".