20945736 has 96 divisors (see below), whose sum is σ = 67716000. Its totient is φ = 5981472.

The previous prime is 20945731. The next prime is 20945747. The reversal of 20945736 is 63754902.

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 20945736.

It is not an unprimeable number, because it can be changed into a prime (20945731) 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, 9595 + ... + 11573.

It is an arithmetic number, because the mean of its divisors is an integer number (705375).

Almost surely, 2^20945736 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 20945736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33858000).

20945736 is an abundant number, since it is smaller than the sum of its proper divisors (46770264).

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

20945736 is a wasteful number, since it uses less digits than its factorization.

20945736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2008 (or 1991 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 20945736 is about 4576.6511774440. The cubic root of 20945736 is about 275.6545773248.

The spelling of 20945736 in words is "twenty million, nine hundred forty-five thousand, seven hundred thirty-six".