20670725 has 18 divisors (see below), whose sum is σ = 27237654. Its totient is φ = 15558400.

The previous prime is 20670719. The next prime is 20670731. The reversal of 20670725 is 52707602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20670719) and next prime (20670731).

It can be written as a sum of positive squares in 9 ways, for example, as 894916 + 19775809 = 946^2 + 4447^2 .

It is not a de Polignac number, because 20670725 - 2¹⁸ = 20408581 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5795 + ... + 8655.

It is an arithmetic number, because the mean of its divisors is an integer number (1513203).

Almost surely, 2^20670725 is an apocalyptic number.

20670725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20670725 is a deficient number, since it is larger than the sum of its proper divisors (6566929).

20670725 is a wasteful number, since it uses less digits than its factorization.

20670725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2905 (or 2883 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 20670725 is about 4546.5069009076. The cubic root of 20670725 is about 274.4428388735.

The spelling of 20670725 in words is "twenty million, six hundred seventy thousand, seven hundred twenty-five".