20489725 has 12 divisors (see below), whose sum is σ = 25635636. Its totient is φ = 16244480.

The previous prime is 20489723. The next prime is 20489737. The reversal of 20489725 is 52798402.

It can be written as a sum of positive squares in 6 ways, for example, as 2393209 + 18096516 = 1547^2 + 4254^2 .

It is not a de Polignac number, because 20489725 - 2¹ = 20489723 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 (20489723) 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, 802 + ... + 6451.

It is an arithmetic number, because the mean of its divisors is an integer number (2136303).

Almost surely, 2^20489725 is an apocalyptic number.

20489725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20489725 is a deficient number, since it is larger than the sum of its proper divisors (5145911).

20489725 is a wasteful number, since it uses less digits than its factorization.

20489725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7376 (or 7371 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 20489725 is about 4526.5577429212. The cubic root of 20489725 is about 273.6394506469.

The spelling of 20489725 in words is "twenty million, four hundred eighty-nine thousand, seven hundred twenty-five".