20210535172 has 12 divisors (see below), whose sum is σ = 35371391580. Its totient is φ = 10104423296.

The previous prime is 20210535143. The next prime is 20210535181. The reversal of 20210535172 is 27153501202.

It can be written as a sum of positive squares in 2 ways, for example, as 166771396 + 20043763776 = 12914^2 + 141576^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20210535172.

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 3 ways as a sum of consecutive naturals, for example, 155593 + ... + 254224.

It is an arithmetic number, because the mean of its divisors is an integer number (2947615965).

Almost surely, 2^20210535172 is an apocalyptic number.

It is an amenable number.

20210535172 is a deficient number, since it is larger than the sum of its proper divisors (15160856408).

20210535172 is a wasteful number, since it uses less digits than its factorization.

20210535172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422150 (or 422148 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The spelling of 20210535172 in words is "twenty billion, two hundred ten million, five hundred thirty-five thousand, one hundred seventy-two".