20491461 has 14 divisors (see below), whose sum is σ = 30724230. Its totient is φ = 13660488.

The previous prime is 20491453. The next prime is 20491469. The reversal of 20491461 is 16419402.

It is an interprime number because it is at equal distance from previous prime (20491453) and next prime (20491469).

It can be written as a sum of positive squares in only one way, i.e., 10850436 + 9641025 = 3294^2 + 3105^2 .

It is not a de Polignac number, because 20491461 - 2³ = 20491453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20491469) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 13326 + ... + 14783.

Almost surely, 2^20491461 is an apocalyptic number.

It is an amenable number.

20491461 is a deficient number, since it is larger than the sum of its proper divisors (10232769).

20491461 is an frugal number, since it uses more digits than its factorization.

20491461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28127 (or 28112 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20491461 is about 4526.7494960512. The cubic root of 20491461 is about 273.6471784986.

The spelling of 20491461 in words is "twenty million, four hundred ninety-one thousand, four hundred sixty-one".