20413251 has 6 divisors (see below), whose sum is σ = 29485820. Its totient is φ = 13608828.

The previous prime is 20413247. The next prime is 20413273. The reversal of 20413251 is 15231402.

20413251 is a `hidden beast` number, since 2 + 0 + 413 + 251 = 666.

It is not a de Polignac number, because 20413251 - 2² = 20413247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20413231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1134061 + ... + 1134078.

Almost surely, 2^20413251 is an apocalyptic number.

20413251 is a deficient number, since it is larger than the sum of its proper divisors (9072569).

20413251 is a wasteful number, since it uses less digits than its factorization.

20413251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268145 (or 2268142 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20413251 is about 4518.1025884767. The cubic root of 20413251 is about 273.2985905011.

Adding to 20413251 its reverse (15231402), we get a palindrome (35644653).

The spelling of 20413251 in words is "twenty million, four hundred thirteen thousand, two hundred fifty-one".