20502101 has 8 divisors (see below), whose sum is σ = 21259800. Its totient is φ = 19747840.

The previous prime is 20502071. The next prime is 20502109. The reversal of 20502101 is 10120502.

It can be written as a sum of positive squares in 4 ways, for example, as 1623076 + 18879025 = 1274^2 + 4345^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20502101 is a prime.

It is a super-2 number, since 2×20502101² = 840672290828402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502109) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 21605 + ... + 22533.

It is an arithmetic number, because the mean of its divisors is an integer number (2657475).

Almost surely, 2^20502101 is an apocalyptic number.

It is an amenable number.

20502101 is a deficient number, since it is larger than the sum of its proper divisors (757699).

20502101 is an equidigital number, since it uses as much as digits as its factorization.

20502101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 20502101 is about 4527.9245797606. The cubic root of 20502101 is about 273.6945332184.

Adding to 20502101 its reverse (10120502), we get a palindrome (30622603).

It can be divided in two parts, 20502 and 101, that multiplied together give a palindrome (2070702).

The spelling of 20502101 in words is "twenty million, five hundred two thousand, one hundred one".