20295720 has 48 divisors (see below), whose sum is σ = 65962260. Its totient is φ = 5412096.

The previous prime is 20295719. The next prime is 20295727. The reversal of 20295720 is 2759202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17288964 + 3006756 = 4158^2 + 1734^2 .

It is not an unprimeable number, because it can be changed into a prime (20295727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27829 + ... + 28548.

Almost surely, 2^20295720 is an apocalyptic number.

20295720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20295720 is an abundant number, since it is smaller than the sum of its proper divisors (45666540).

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

20295720 is a wasteful number, since it uses less digits than its factorization.

20295720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56394 (or 56387 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 20295720 is about 4505.0771358546. The cubic root of 20295720 is about 272.7730674615.

The spelling of 20295720 in words is "twenty million, two hundred ninety-five thousand, seven hundred twenty".