20213433 has 24 divisors (see below), whose sum is σ = 30333576. Its totient is φ = 12960000.

The previous prime is 20213419. The next prime is 20213437. The reversal of 20213433 is 33431202.

20213433 is a `hidden beast` number, since 20 + 213 + 433 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 16064064 + 4149369 = 4008^2 + 2037^2 .

It is not a de Polignac number, because 20213433 - 2¹² = 20209337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20213437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33333 + ... + 33933.

It is an arithmetic number, because the mean of its divisors is an integer number (1263899).

Almost surely, 2^20213433 is an apocalyptic number.

It is an amenable number.

20213433 is a deficient number, since it is larger than the sum of its proper divisors (10120143).

20213433 is a wasteful number, since it uses less digits than its factorization.

20213433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 20213433 is about 4495.9351641233. The cubic root of 20213433 is about 272.4039242709.

Adding to 20213433 its reverse (33431202), we get a palindrome (53644635).

The spelling of 20213433 in words is "twenty million, two hundred thirteen thousand, four hundred thirty-three".