20651432 has 8 divisors (see below), whose sum is σ = 38721450. Its totient is φ = 10325712.

The previous prime is 20651429. The next prime is 20651437. The reversal of 20651432 is 23415602.

It can be written as a sum of positive squares in only one way, i.e., 15570916 + 5080516 = 3946^2 + 2254^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20651398 and 20651407.

It is not an unprimeable number, because it can be changed into a prime (20651437) by changing a digit.

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, 1290707 + ... + 1290722.

Almost surely, 2^20651432 is an apocalyptic number.

It is an amenable number.

20651432 is a deficient number, since it is larger than the sum of its proper divisors (18070018).

20651432 is a wasteful number, since it uses less digits than its factorization.

20651432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581435 (or 2581431 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20651432 is about 4544.3846668168. The cubic root of 20651432 is about 274.3574286480.

The spelling of 20651432 in words is "twenty million, six hundred fifty-one thousand, four hundred thirty-two".