20356101 has 6 divisors (see below), whose sum is σ = 29403270. Its totient is φ = 13570728.

The previous prime is 20356097. The next prime is 20356103. The reversal of 20356101 is 10165302.

20356101 is a `hidden beast` number, since 20 + 35 + 610 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19793601 + 562500 = 4449^2 + 750^2 .

It is not a de Polignac number, because 20356101 - 2² = 20356097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20356103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1130886 + ... + 1130903.

It is an arithmetic number, because the mean of its divisors is an integer number (4900545).

Almost surely, 2^20356101 is an apocalyptic number.

It is an amenable number.

20356101 is a deficient number, since it is larger than the sum of its proper divisors (9047169).

20356101 is a wasteful number, since it uses less digits than its factorization.

20356101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261795 (or 2261792 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 20356101 is about 4511.7735980432. The cubic root of 20356101 is about 273.0433051296.

The spelling of 20356101 in words is "twenty million, three hundred fifty-six thousand, one hundred one".