20061491 has 2 divisors, whose sum is σ = 20061492. Its totient is φ = 20061490.

The previous prime is 20061449. The next prime is 20061493. The reversal of 20061491 is 19416002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20061491 - 2⁶ = 20061427 is a prime.

It is a super-2 number, since 2×20061491² = 804926842286162, which contains 22 as substring.

Together with 20061493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20061493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10030745 + 10030746.

It is an arithmetic number, because the mean of its divisors is an integer number (10030746).

Almost surely, 2^20061491 is an apocalyptic number.

20061491 is a deficient number, since it is larger than the sum of its proper divisors (1).

20061491 is an equidigital number, since it uses as much as digits as its factorization.

20061491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 20061491 is about 4479.0055815996. The cubic root of 20061491 is about 271.7196641349.

Adding to 20061491 its reverse (19416002), we get a palindrome (39477493).

The spelling of 20061491 in words is "twenty million, sixty-one thousand, four hundred ninety-one".