20520461 has 16 divisors (see below), whose sum is σ = 22758960. Its totient is φ = 18385920.

The previous prime is 20520433. The next prime is 20520499. The reversal of 20520461 is 16402502.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5851561 + 14668900 = 2419^2 + 3830^2 .

It is a cyclic number.

It is not a de Polignac number, because 20520461 - 2²² = 16326157 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 (20520421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89495 + ... + 89723.

It is an arithmetic number, because the mean of its divisors is an integer number (1422435).

Almost surely, 2^20520461 is an apocalyptic number.

It is an amenable number.

20520461 is a deficient number, since it is larger than the sum of its proper divisors (2238499).

20520461 is a wasteful number, since it uses less digits than its factorization.

20520461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20520461 is about 4529.9515449947. The cubic root of 20520461 is about 273.7762083010.

Adding to 20520461 its reverse (16402502), we get a palindrome (36922963).

It can be divided in two parts, 205204 and 61, that multiplied together give a square (12517444 = 3538²).

The spelling of 20520461 in words is "twenty million, five hundred twenty thousand, four hundred sixty-one".