20812402 has 8 divisors (see below), whose sum is σ = 33620076. Its totient is φ = 9605712.

The previous prime is 20812397. The next prime is 20812409. The reversal of 20812402 is 20421802.

20812402 is nontrivially palindromic in base 14.

It can be written as a sum of positive squares in 2 ways, for example, as 14814801 + 5997601 = 3849^2 + 2449^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20812402.

It is not an unprimeable number, because it can be changed into a prime (20812409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400213 + ... + 400264.

Almost surely, 2^20812402 is an apocalyptic number.

20812402 is a deficient number, since it is larger than the sum of its proper divisors (12807674).

20812402 is a wasteful number, since it uses less digits than its factorization.

20812402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800492.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 20812402 is about 4562.0611569772. The cubic root of 20812402 is about 275.0684215424.

The spelling of 20812402 in words is "twenty million, eight hundred twelve thousand, four hundred two".