20775461 has 6 divisors (see below), whose sum is σ = 24167430. Its totient is φ = 17807496.

The previous prime is 20775449. The next prime is 20775511. The reversal of 20775461 is 16457702.

It can be written as a sum of positive squares in only one way, i.e., 16654561 + 4120900 = 4081^2 + 2030^2 .

It is not a de Polignac number, because 20775461 - 2¹⁰ = 20774437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211946 + ... + 212043.

It is an arithmetic number, because the mean of its divisors is an integer number (4027905).

Almost surely, 2^20775461 is an apocalyptic number.

It is an amenable number.

20775461 is a deficient number, since it is larger than the sum of its proper divisors (3391969).

20775461 is an equidigital number, since it uses as much as digits as its factorization.

20775461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424003 (or 423996 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 20775461 is about 4558.0106406194. The cubic root of 20775461 is about 274.9055808087.

The spelling of 20775461 in words is "twenty million, seven hundred seventy-five thousand, four hundred sixty-one".