20541497 has 2 divisors, whose sum is σ = 20541498. Its totient is φ = 20541496.

The previous prime is 20541449. The next prime is 20541511. The reversal of 20541497 is 79414502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17732521 + 2808976 = 4211^2 + 1676^2 .

It is a cyclic number.

It is not a de Polignac number, because 20541497 - 2¹² = 20537401 is a prime.

It is not a weakly prime, because it can be changed into another prime (20541407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10270748 + 10270749.

It is an arithmetic number, because the mean of its divisors is an integer number (10270749).

Almost surely, 2^20541497 is an apocalyptic number.

It is an amenable number.

20541497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20541497 is an equidigital number, since it uses as much as digits as its factorization.

20541497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 20541497 is about 4532.2728293870. The cubic root of 20541497 is about 273.8697277966.

Adding to 20541497 its reverse (79414502), we get a palindrome (99955999).

The spelling of 20541497 in words is "twenty million, five hundred forty-one thousand, four hundred ninety-seven".