20807461 has 4 divisors (see below), whose sum is σ = 20900992. Its totient is φ = 20713932.

The previous prime is 20807447. The next prime is 20807483. The reversal of 20807461 is 16470802.

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 a cyclic number.

It is not a de Polignac number, because 20807461 - 2¹³ = 20799269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20807561) 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, 46431 + ... + 46876.

It is an arithmetic number, because the mean of its divisors is an integer number (5225248).

Almost surely, 2^20807461 is an apocalyptic number.

It is an amenable number.

20807461 is a deficient number, since it is larger than the sum of its proper divisors (93531).

20807461 is an equidigital number, since it uses as much as digits as its factorization.

20807461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93530.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20807461 is about 4561.5195932934. The cubic root of 20807461 is about 275.0466521404.

The spelling of 20807461 in words is "twenty million, eight hundred seven thousand, four hundred sixty-one".