20813434 has 4 divisors (see below), whose sum is σ = 31220154. Its totient is φ = 10406716.

The previous prime is 20813399. The next prime is 20813447. The reversal of 20813434 is 43431802.

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., 14326225 + 6487209 = 3785^2 + 2547^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20813399 and 20813408.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5203357 + ... + 5203360.

Almost surely, 2^20813434 is an apocalyptic number.

20813434 is a deficient number, since it is larger than the sum of its proper divisors (10406720).

20813434 is a wasteful number, since it uses less digits than its factorization.

20813434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10406719.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20813434 is about 4562.1742623447. The cubic root of 20813434 is about 275.0729679649.

The spelling of 20813434 in words is "twenty million, eight hundred thirteen thousand, four hundred thirty-four".