20853725 has 6 divisors (see below), whose sum is σ = 25858650. Its totient is φ = 16682960.

The previous prime is 20853719. The next prime is 20853757. The reversal of 20853725 is 52735802.

It can be written as a sum of positive squares in 3 ways, for example, as 3829849 + 17023876 = 1957^2 + 4126^2 .

It is not a de Polignac number, because 20853725 - 2⁶ = 20853661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20853691 and 20853700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 417050 + ... + 417099.

It is an arithmetic number, because the mean of its divisors is an integer number (4309775).

Almost surely, 2^20853725 is an apocalyptic number.

20853725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20853725 is a deficient number, since it is larger than the sum of its proper divisors (5004925).

20853725 is an equidigital number, since it uses as much as digits as its factorization.

20853725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834159 (or 834154 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 20853725 is about 4566.5878946977. The cubic root of 20853725 is about 275.2503505327.

The spelling of 20853725 in words is "twenty million, eight hundred fifty-three thousand, seven hundred twenty-five".