20738987 has 2 divisors, whose sum is σ = 20738988. Its totient is φ = 20738986.

The previous prime is 20738957. The next prime is 20738999. The reversal of 20738987 is 78983702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20738987 - 2²² = 16544683 is a prime.

It is not a weakly prime, because it can be changed into another prime (20738917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10369493 + 10369494.

It is an arithmetic number, because the mean of its divisors is an integer number (10369494).

Almost surely, 2^20738987 is an apocalyptic number.

20738987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20738987 is an equidigital number, since it uses as much as digits as its factorization.

20738987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 20738987 is about 4554.0077953381. The cubic root of 20738987 is about 274.7446091745.

The spelling of 20738987 in words is "twenty million, seven hundred thirty-eight thousand, nine hundred eighty-seven".