20545101 has 24 divisors (see below), whose sum is σ = 30825600. Its totient is φ = 13175136.

The previous prime is 20545097. The next prime is 20545127. The reversal of 20545101 is 10154502.

20545101 is a `hidden beast` number, since 20 + 545 + 101 = 666.

It is not a de Polignac number, because 20545101 - 2² = 20545097 is a prime.

It is a super-3 number, since 3×20545101³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34000 + ... + 34598.

It is an arithmetic number, because the mean of its divisors is an integer number (1284400).

Almost surely, 2^20545101 is an apocalyptic number.

It is an amenable number.

20545101 is a deficient number, since it is larger than the sum of its proper divisors (10280499).

20545101 is a wasteful number, since it uses less digits than its factorization.

20545101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 20545101 is about 4532.6704049600. The cubic root of 20545101 is about 273.8857436495.

Adding to 20545101 its reverse (10154502), we get a palindrome (30699603).

The spelling of 20545101 in words is "twenty million, five hundred forty-five thousand, one hundred one".