20747834 has 4 divisors (see below), whose sum is σ = 31121754. Its totient is φ = 10373916.

The previous prime is 20747827. The next prime is 20747873. The reversal of 20747834 is 43874702.

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., 12355225 + 8392609 = 3515^2 + 2897^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20747794 and 20747803.

It is an unprimeable number.

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, 5186957 + ... + 5186960.

Almost surely, 2^20747834 is an apocalyptic number.

20747834 is a deficient number, since it is larger than the sum of its proper divisors (10373920).

20747834 is a wasteful number, since it uses less digits than its factorization.

20747834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10373919.

The product of its (nonzero) digits is 37632, while the sum is 35.

The square root of 20747834 is about 4554.9790339803. The cubic root of 20747834 is about 274.7836711918.

The spelling of 20747834 in words is "twenty million, seven hundred forty-seven thousand, eight hundred thirty-four".