20783432 has 16 divisors (see below), whose sum is σ = 39608700. Its totient is φ = 10221120.

The previous prime is 20783407. The next prime is 20783437. The reversal of 20783432 is 23438702.

It can be written as a sum of positive squares in 2 ways, for example, as 15792676 + 4990756 = 3974^2 + 2234^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20783395 and 20783404.

It is not an unprimeable number, because it can be changed into a prime (20783437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20807 + ... + 21782.

Almost surely, 2^20783432 is an apocalyptic number.

It is an amenable number.

20783432 is a deficient number, since it is larger than the sum of its proper divisors (18825268).

20783432 is a wasteful number, since it uses less digits than its factorization.

20783432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42656 (or 42652 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 20783432 is about 4558.8849513889. The cubic root of 20783432 is about 274.9407343359.

The spelling of 20783432 in words is "twenty million, seven hundred eighty-three thousand, four hundred thirty-two".