20784034 has 4 divisors (see below), whose sum is σ = 31176054. Its totient is φ = 10392016.

The previous prime is 20784017. The next prime is 20784037. The reversal of 20784034 is 43048702.

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., 19580625 + 1203409 = 4425^2 + 1097^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20783993 and 20784011.

It is not an unprimeable number, because it can be changed into a prime (20784037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5196007 + ... + 5196010.

Almost surely, 2^20784034 is an apocalyptic number.

20784034 is a deficient number, since it is larger than the sum of its proper divisors (10392020).

20784034 is a wasteful number, since it uses less digits than its factorization.

20784034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10392019.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 20784034 is about 4558.9509758277. The cubic root of 20784034 is about 274.9433888979.

The spelling of 20784034 in words is "twenty million, seven hundred eighty-four thousand, thirty-four".