20402413 has 4 divisors (see below), whose sum is σ = 20416320. Its totient is φ = 20388508.

The previous prime is 20402411. The next prime is 20402419. The reversal of 20402413 is 31420402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20402413 - 2¹ = 20402411 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402411) 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, 4453 + ... + 7786.

It is an arithmetic number, because the mean of its divisors is an integer number (5104080).

Almost surely, 2^20402413 is an apocalyptic number.

It is an amenable number.

20402413 is a deficient number, since it is larger than the sum of its proper divisors (13907).

20402413 is a wasteful number, since it uses less digits than its factorization.

20402413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13906.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20402413 is about 4516.9030319457. The cubic root of 20402413 is about 273.2502144980.

Adding to 20402413 its reverse (31420402), we get a palindrome (51822815).

The spelling of 20402413 in words is "twenty million, four hundred two thousand, four hundred thirteen".