20511325 has 12 divisors (see below), whose sum is σ = 25632288. Its totient is φ = 16281200.

The previous prime is 20511319. The next prime is 20511341. The reversal of 20511325 is 52311502.

It is not a de Polignac number, because 20511325 - 2¹⁷ = 20380253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144 + ... + 6406.

It is an arithmetic number, because the mean of its divisors is an integer number (2136024).

Almost surely, 2^20511325 is an apocalyptic number.

20511325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20511325 is a deficient number, since it is larger than the sum of its proper divisors (5120963).

20511325 is a wasteful number, since it uses less digits than its factorization.

20511325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6404 (or 6399 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 20511325 is about 4528.9430334240. The cubic root of 20511325 is about 273.7355725874.

Adding to 20511325 its reverse (52311502), we get a palindrome (72822827).

The spelling of 20511325 in words is "twenty million, five hundred eleven thousand, three hundred twenty-five".