20461151 has 2 divisors, whose sum is σ = 20461152. Its totient is φ = 20461150.

The previous prime is 20461139. The next prime is 20461171. The reversal of 20461151 is 15116402.

It is an a-pointer prime, because the next prime (20461171) can be obtained adding 20461151 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20461151 - 2¹⁸ = 20199007 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20461171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10230575 + 10230576.

It is an arithmetic number, because the mean of its divisors is an integer number (10230576).

Almost surely, 2^20461151 is an apocalyptic number.

20461151 is a deficient number, since it is larger than the sum of its proper divisors (1).

20461151 is an equidigital number, since it uses as much as digits as its factorization.

20461151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 20461151 is about 4523.4003802449. The cubic root of 20461151 is about 273.5121899322.

Adding to 20461151 its reverse (15116402), we get a palindrome (35577553).

The spelling of 20461151 in words is "twenty million, four hundred sixty-one thousand, one hundred fifty-one".