20649932 has 6 divisors (see below), whose sum is σ = 36137388. Its totient is φ = 10324964.

The previous prime is 20649931. The next prime is 20649947. The reversal of 20649932 is 23994602.

It is a junction number, because it is equal to n+sod(n) for n = 20649892 and 20649901.

It is not an unprimeable number, because it can be changed into a prime (20649931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2581238 + ... + 2581245.

It is an arithmetic number, because the mean of its divisors is an integer number (6022898).

Almost surely, 2^20649932 is an apocalyptic number.

It is an amenable number.

20649932 is a deficient number, since it is larger than the sum of its proper divisors (15487456).

20649932 is a wasteful number, since it uses less digits than its factorization.

20649932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5162487 (or 5162485 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 20649932 is about 4544.2196249741. The cubic root of 20649932 is about 274.3507859108.

The spelling of 20649932 in words is "twenty million, six hundred forty-nine thousand, nine hundred thirty-two".