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20025997 = 533731013
BaseRepresentation
bin100110001100…
…1001010001101
31101200102111121
41030121022031
520111312442
61553120541
7332134555
oct114311215
941612447
1020025997
1110338912
126859151
1341c2204
142934165
151b58967
hex131928d

20025997 has 8 divisors (see below), whose sum is σ = 20478744. Its totient is φ = 19576128.

The previous prime is 20025989. The next prime is 20026001. The reversal of 20025997 is 79952002.

It can be written as a sum of positive squares in 4 ways, for example, as 498436 + 19527561 = 706^2 + 4419^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20025997 - 23 = 20025989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20025937) 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, 19263 + ... + 20275.

It is an arithmetic number, because the mean of its divisors is an integer number (2559843).

Almost surely, 220025997 is an apocalyptic number.

It is an amenable number.

20025997 is a deficient number, since it is larger than the sum of its proper divisors (452747).

20025997 is a wasteful number, since it uses less digits than its factorization.

20025997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 20025997 is about 4475.0415640528. The cubic root of 20025997 is about 271.5593219286.

Adding to 20025997 its reverse (79952002), we get a palindrome (99977999).

The spelling of 20025997 in words is "twenty million, twenty-five thousand, nine hundred ninety-seven".

Divisors: 1 53 373 1013 19769 53689 377849 20025997