20213436 has 24 divisors (see below), whose sum is σ = 47469520. Its totient is φ = 6694272.

The previous prime is 20213419. The next prime is 20213437. The reversal of 20213436 is 63431202.

It is a happy number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3481 + ... + 7248.

Almost surely, 2^20213436 is an apocalyptic number.

It is an amenable number.

20213436 is an abundant number, since it is smaller than the sum of its proper divisors (27256084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20213436 is a wasteful number, since it uses less digits than its factorization.

20213436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10893 (or 10891 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 20213436 is about 4495.9354977579. The cubic root of 20213436 is about 272.4039377472.

Adding to 20213436 its reverse (63431202), we get a palindrome (83644638).

The spelling of 20213436 in words is "twenty million, two hundred thirteen thousand, four hundred thirty-six".