20390433 has 32 divisors (see below), whose sum is σ = 32280576. Its totient is φ = 11207808.

The previous prime is 20390431. The next prime is 20390483. The reversal of 20390433 is 33409302.

It is not a de Polignac number, because 20390433 - 2¹ = 20390431 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20390431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71910 + ... + 72192.

It is an arithmetic number, because the mean of its divisors is an integer number (1008768).

Almost surely, 2^20390433 is an apocalyptic number.

It is an amenable number.

20390433 is a deficient number, since it is larger than the sum of its proper divisors (11890143).

20390433 is a wasteful number, since it uses less digits than its factorization.

20390433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413.

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 20390433 is about 4515.5767073542. The cubic root of 20390433 is about 273.1967211767.

Adding to 20390433 its reverse (33409302), we get a palindrome (53799735).

The spelling of 20390433 in words is "twenty million, three hundred ninety thousand, four hundred thirty-three".