20512461 has 4 divisors (see below), whose sum is σ = 27349952. Its totient is φ = 13674972.

The previous prime is 20512447. The next prime is 20512469. The reversal of 20512461 is 16421502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20512461 - 2¹⁰ = 20511437 is a prime.

It is a super-2 number, since 2×20512461² = 841522112553042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20512469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3418741 + ... + 3418746.

It is an arithmetic number, because the mean of its divisors is an integer number (6837488).

Almost surely, 2^20512461 is an apocalyptic number.

It is an amenable number.

20512461 is a deficient number, since it is larger than the sum of its proper divisors (6837491).

20512461 is an equidigital number, since it uses as much as digits as its factorization.

20512461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6837490.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20512461 is about 4529.0684472637. The cubic root of 20512461 is about 273.7406260212.

Adding to 20512461 its reverse (16421502), we get a palindrome (36933963).

The spelling of 20512461 in words is "twenty million, five hundred twelve thousand, four hundred sixty-one".