20802634 has 4 divisors (see below), whose sum is σ = 31203954. Its totient is φ = 10401316.

The previous prime is 20802631. The next prime is 20802637. The reversal of 20802634 is 43620802.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (20802631) and next prime (20802637).

It can be written as a sum of positive squares in only one way, i.e., 20277009 + 525625 = 4503^2 + 725^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20802599 and 20802608.

It is not an unprimeable number, because it can be changed into a prime (20802631) 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 as a sum of consecutive naturals, namely, 5200657 + ... + 5200660.

Almost surely, 2^20802634 is an apocalyptic number.

20802634 is a deficient number, since it is larger than the sum of its proper divisors (10401320).

20802634 is a wasteful number, since it uses less digits than its factorization.

20802634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10401319.

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

The square root of 20802634 is about 4560.9904626079. The cubic root of 20802634 is about 275.0253816793.

The spelling of 20802634 in words is "twenty million, eight hundred two thousand, six hundred thirty-four".