20666632 has 24 divisors (see below), whose sum is σ = 45077310. Its totient is φ = 8856960.

The previous prime is 20666621. The next prime is 20666651. The reversal of 20666632 is 23666602.

It can be written as a sum of positive squares in only one way, i.e., 20196036 + 470596 = 4494^2 + 686^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20666594 and 20666603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25969 + ... + 26752.

Almost surely, 2^20666632 is an apocalyptic number.

It is an amenable number.

20666632 is an abundant number, since it is smaller than the sum of its proper divisors (24410678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20666632 is a wasteful number, since it uses less digits than its factorization.

20666632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52741 (or 52730 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 20666632 is about 4546.0567528354. The cubic root of 20666632 is about 274.4247235810.

The spelling of 20666632 in words is "twenty million, six hundred sixty-six thousand, six hundred thirty-two".