20025657 has 8 divisors (see below), whose sum is σ = 29667680. Its totient is φ = 13350420.

The previous prime is 20025637. The next prime is 20025661. The reversal of 20025657 is 75652002.

20025657 is a `hidden beast` number, since 2 + 0 + 0 + 2 + 5 + 657 = 666.

It is not a de Polignac number, because 20025657 - 2¹⁰ = 20024633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 741691 = 20025657 / (2 + 0 + 0 + 2 + 5 + 6 + 5 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20025657.

It is not an unprimeable number, because it can be changed into a prime (20025637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370819 + ... + 370872.

It is an arithmetic number, because the mean of its divisors is an integer number (3708460).

Almost surely, 2^20025657 is an apocalyptic number.

20025657 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20025657 is a deficient number, since it is larger than the sum of its proper divisors (9642023).

20025657 is an equidigital number, since it uses as much as digits as its factorization.

20025657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741700 (or 741694 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 20025657 is about 4475.0035754176. The cubic root of 20025657 is about 271.5577850814.

Adding to 20025657 its reverse (75652002), we get a palindrome (95677659).

The spelling of 20025657 in words is "twenty million, twenty-five thousand, six hundred fifty-seven".