20993125 has 10 divisors (see below), whose sum is σ = 26233790. Its totient is φ = 16794000.

The previous prime is 20993123. The next prime is 20993131. The reversal of 20993125 is 52139902.

It can be written as a sum of positive squares in 5 ways, for example, as 2313441 + 18679684 = 1521^2 + 4322^2 .

It is not a de Polignac number, because 20993125 - 2¹ = 20993123 is a prime.

It is a super-2 number, since 2×20993125² = 881422594531250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20993123) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 16170 + ... + 17419.

It is an arithmetic number, because the mean of its divisors is an integer number (2623379).

Almost surely, 2^20993125 is an apocalyptic number.

20993125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20993125 is a deficient number, since it is larger than the sum of its proper divisors (5240665).

20993125 is an frugal number, since it uses more digits than its factorization.

20993125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33609 (or 33594 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 20993125 is about 4581.8255095540. The cubic root of 20993125 is about 275.8623070445.

The spelling of 20993125 in words is "twenty million, nine hundred ninety-three thousand, one hundred twenty-five".