20823725 has 24 divisors (see below), whose sum is σ = 29451240. Its totient is φ = 14469120.

The previous prime is 20823721. The next prime is 20823727. The reversal of 20823725 is 52732802.

It can be written as a sum of positive squares in 12 ways, for example, as 3200521 + 17623204 = 1789^2 + 4198^2 .

It is not a de Polignac number, because 20823725 - 2² = 20823721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20823721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3641 + ... + 7409.

It is an arithmetic number, because the mean of its divisors is an integer number (1227135).

Almost surely, 2^20823725 is an apocalyptic number.

20823725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20823725 is a deficient number, since it is larger than the sum of its proper divisors (8627515).

20823725 is a wasteful number, since it uses less digits than its factorization.

20823725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3809 (or 3804 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20823725 is about 4563.3019843092. The cubic root of 20823725 is about 275.1182962129.

The spelling of 20823725 in words is "twenty million, eight hundred twenty-three thousand, seven hundred twenty-five".