20783426 has 4 divisors (see below), whose sum is σ = 31175142. Its totient is φ = 10391712.

The previous prime is 20783407. The next prime is 20783437. The reversal of 20783426 is 62438702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62438702 = 2 ⋅31219351.

It can be written as a sum of positive squares in only one way, i.e., 16394401 + 4389025 = 4049^2 + 2095^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20783392 and 20783401.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5195855 + ... + 5195858.

Almost surely, 2^20783426 is an apocalyptic number.

20783426 is a deficient number, since it is larger than the sum of its proper divisors (10391716).

20783426 is a wasteful number, since it uses less digits than its factorization.

20783426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10391715.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20783426 is about 4558.8842933332. The cubic root of 20783426 is about 274.9407078782.

The spelling of 20783426 in words is "twenty million, seven hundred eighty-three thousand, four hundred twenty-six".