20787072 has 32 divisors (see below), whose sum is σ = 55216680. Its totient is φ = 6928896.

The previous prime is 20787061. The next prime is 20787079. The reversal of 20787072 is 27078702.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20787079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26683 + ... + 27450.

Almost surely, 2^20787072 is an apocalyptic number.

It is an amenable number.

20787072 is an abundant number, since it is smaller than the sum of its proper divisors (34429608).

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

20787072 is an equidigital number, since it uses as much as digits as its factorization.

20787072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54150 (or 54138 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 20787072 is about 4559.2841543383. The cubic root of 20787072 is about 274.9567843937.

The spelling of 20787072 in words is "twenty million, seven hundred eighty-seven thousand, seventy-two".