20402113 has 4 divisors (see below), whose sum is σ = 20681668. Its totient is φ = 20122560.

The previous prime is 20402099. The next prime is 20402119. The reversal of 20402113 is 31120402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31120402 = 2 ⋅15560201.

It can be written as a sum of positive squares in 2 ways, for example, as 14311089 + 6091024 = 3783^2 + 2468^2 .

It is a cyclic number.

It is not a de Polignac number, because 20402113 - 2¹³ = 20393921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20402093 and 20402102.

It is not an unprimeable number, because it can be changed into a prime (20402119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139668 + ... + 139813.

It is an arithmetic number, because the mean of its divisors is an integer number (5170417).

Almost surely, 2^20402113 is an apocalyptic number.

It is an amenable number.

20402113 is a deficient number, since it is larger than the sum of its proper divisors (279555).

20402113 is an equidigital number, since it uses as much as digits as its factorization.

20402113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279554.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20402113 is about 4516.8698232294. The cubic root of 20402113 is about 273.2488751880.

Adding to 20402113 its reverse (31120402), we get a palindrome (51522515).

The spelling of 20402113 in words is "twenty million, four hundred two thousand, one hundred thirteen".