20723425 has 12 divisors (see below), whose sum is σ = 27209196. Its totient is φ = 15603200.

The previous prime is 20723419. The next prime is 20723431. The reversal of 20723425 is 52432702.

It is an interprime number because it is at equal distance from previous prime (20723419) and next prime (20723431).

It can be written as a sum of positive squares in 6 ways, for example, as 1957201 + 18766224 = 1399^2 + 4332^2 .

It is not a de Polignac number, because 20723425 - 2⁵ = 20723393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 20723425.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23956 + ... + 24805.

It is an arithmetic number, because the mean of its divisors is an integer number (2267433).

Almost surely, 2^20723425 is an apocalyptic number.

20723425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20723425 is a deficient number, since it is larger than the sum of its proper divisors (6485771).

20723425 is a wasteful number, since it uses less digits than its factorization.

20723425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48788 (or 48783 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 20723425 is about 4552.2988698019. The cubic root of 20723425 is about 274.6758715600.

It can be divided in two parts, 207 and 23425, that added together give a palindrome (23632).

The spelling of 20723425 in words is "twenty million, seven hundred twenty-three thousand, four hundred twenty-five".