20666952 has 48 divisors (see below), whose sum is σ = 57346380. Its totient is φ = 6720000.

The previous prime is 20666941. The next prime is 20666959. The reversal of 20666952 is 25966602.

It can be written as a sum of positive squares in 2 ways, for example, as 18610596 + 2056356 = 4314^2 + 1434^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20666959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 549 + ... + 6452.

Almost surely, 2^20666952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20666952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28673190).

20666952 is an abundant number, since it is smaller than the sum of its proper divisors (36679428).

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

20666952 is a wasteful number, since it uses less digits than its factorization.

20666952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7054 (or 7047 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 20666952 is about 4546.0919480362. The cubic root of 20666952 is about 274.4261399618.

The spelling of 20666952 in words is "twenty million, six hundred sixty-six thousand, nine hundred fifty-two".