20761487 has 2 divisors, whose sum is σ = 20761488. Its totient is φ = 20761486.

The previous prime is 20761469. The next prime is 20761493. The reversal of 20761487 is 78416702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20761487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20761417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10380743 + 10380744.

It is an arithmetic number, because the mean of its divisors is an integer number (10380744).

Almost surely, 2^20761487 is an apocalyptic number.

20761487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20761487 is an equidigital number, since it uses as much as digits as its factorization.

20761487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 20761487 is about 4556.4774771747. The cubic root of 20761487 is about 274.8439312789.

The spelling of 20761487 in words is "twenty million, seven hundred sixty-one thousand, four hundred eighty-seven".