20471976 has 96 divisors (see below), whose sum is σ = 64022400. Its totient is φ = 5788800.

The previous prime is 20471963. The next prime is 20471977. The reversal of 20471976 is 67917402.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20471976.

It is not an unprimeable number, because it can be changed into a prime (20471977) 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, 75970 + ... + 76238.

It is an arithmetic number, because the mean of its divisors is an integer number (666900).

Almost surely, 2^20471976 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 20471976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32011200).

20471976 is an abundant number, since it is smaller than the sum of its proper divisors (43550424).

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

20471976 is a wasteful number, since it uses less digits than its factorization.

20471976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 20471976 is about 4524.5967776146. The cubic root of 20471976 is about 273.5604154284.

The spelling of 20471976 in words is "twenty million, four hundred seventy-one thousand, nine hundred seventy-six".