20288450 has 90 divisors (see below), whose sum is σ = 47670219. Its totient is φ = 6420960.

The previous prime is 20288441. The next prime is 20288459. The reversal of 20288450 is 5488202.

It is an interprime number because it is at equal distance from previous prime (20288441) and next prime (20288459).

It can be written as a sum of positive squares in 5 ways, for example, as 1270129 + 19018321 = 1127^2 + 4361^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3185.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20288459) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1560644 + ... + 1560656.

Almost surely, 2^20288450 is an apocalyptic number.

20288450 is an abundant number, since it is smaller than the sum of its proper divisors (27381769).

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

20288450 is an equidigital number, since it uses as much as digits as its factorization.

20288450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 27 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 20288450 is about 4504.2701961583. The cubic root of 20288450 is about 272.7404941402.

The spelling of 20288450 in words is "twenty million, two hundred eighty-eight thousand, four hundred fifty".