20652461 has 4 divisors (see below), whose sum is σ = 20682300. Its totient is φ = 20622624.

The previous prime is 20652439. The next prime is 20652493. The reversal of 20652461 is 16425602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16425602 = 2 ⋅8212801.

It can be written as a sum of positive squares in 2 ways, for example, as 3924361 + 16728100 = 1981^2 + 4090^2 .

It is a cyclic number.

It is not a de Polignac number, because 20652461 - 2¹⁰ = 20651437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20652461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20652761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13856 + ... + 15273.

It is an arithmetic number, because the mean of its divisors is an integer number (5170575).

Almost surely, 2^20652461 is an apocalyptic number.

It is an amenable number.

20652461 is a deficient number, since it is larger than the sum of its proper divisors (29839).

20652461 is an equidigital number, since it uses as much as digits as its factorization.

20652461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29838.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20652461 is about 4544.4978820547. The cubic root of 20652461 is about 274.3619853797.

The spelling of 20652461 in words is "twenty million, six hundred fifty-two thousand, four hundred sixty-one".