20952666 has 48 divisors (see below), whose sum is σ = 52228800. Its totient is φ = 5946624.

The previous prime is 20952637. The next prime is 20952667. The reversal of 20952666 is 66625902.

It is a self number, because there is not a number n which added to its sum of digits gives 20952666.

It is not an unprimeable number, because it can be changed into a prime (20952667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22090 + ... + 23018.

It is an arithmetic number, because the mean of its divisors is an integer number (1088100).

Almost surely, 2^20952666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20952666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26114400).

20952666 is an abundant number, since it is smaller than the sum of its proper divisors (31276134).

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

20952666 is a wasteful number, since it uses less digits than its factorization.

20952666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123 (or 1120 counting only the distinct ones).

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

The square root of 20952666 is about 4577.4082186320. The cubic root of 20952666 is about 275.6849745312.

It can be divided in two parts, 2095 and 2666, that added together give a square (4761 = 69²).

The spelling of 20952666 in words is "twenty million, nine hundred fifty-two thousand, six hundred sixty-six".