20435131 has 2 divisors, whose sum is σ = 20435132. Its totient is φ = 20435130.

The previous prime is 20435119. The next prime is 20435153. The reversal of 20435131 is 13153402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20435131 - 2⁵ = 20435099 is a prime.

It is a super-2 number, since 2×20435131² = 835189157974322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20435099 and 20435108.

It is not a weakly prime, because it can be changed into another prime (20435101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217565 + 10217566.

It is an arithmetic number, because the mean of its divisors is an integer number (10217566).

Almost surely, 2^20435131 is an apocalyptic number.

20435131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20435131 is an equidigital number, since it uses as much as digits as its factorization.

20435131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20435131 is about 4520.5233104144. The cubic root of 20435131 is about 273.3962009202.

Adding to 20435131 its reverse (13153402), we get a palindrome (33588533).

The spelling of 20435131 in words is "twenty million, four hundred thirty-five thousand, one hundred thirty-one".