20447952 has 80 divisors (see below), whose sum is σ = 63567360. Its totient is φ = 5533056.

The previous prime is 20447951. The next prime is 20447953. The reversal of 20447952 is 25974402.

It is an interprime number because it is at equal distance from previous prime (20447951) and next prime (20447953).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20447951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4783 + ... + 7985.

It is an arithmetic number, because the mean of its divisors is an integer number (794592).

Almost surely, 2^20447952 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 20447952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31783680).

20447952 is an abundant number, since it is smaller than the sum of its proper divisors (43119408).

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

20447952 is a wasteful number, since it uses less digits than its factorization.

20447952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3240 (or 3234 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 20447952 is about 4521.9411760880. The cubic root of 20447952 is about 273.4533652204.

The spelling of 20447952 in words is "twenty million, four hundred forty-seven thousand, nine hundred fifty-two".