20213434 has 4 divisors (see below), whose sum is σ = 30320154. Its totient is φ = 10106716.

The previous prime is 20213419. The next prime is 20213437. The reversal of 20213434 is 43431202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10272025 + 9941409 = 3205^2 + 3153^2 .

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 as a sum of consecutive naturals, namely, 5053357 + ... + 5053360.

Almost surely, 2^20213434 is an apocalyptic number.

20213434 is a deficient number, since it is larger than the sum of its proper divisors (10106720).

20213434 is a wasteful number, since it uses less digits than its factorization.

20213434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10106719.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 20213434 is about 4495.9352753348. The cubic root of 20213434 is about 272.4039287630.

Adding to 20213434 its reverse (43431202), we get a palindrome (63644636).

The spelling of 20213434 in words is "twenty million, two hundred thirteen thousand, four hundred thirty-four".