19900747 has 2 divisors, whose sum is σ = 19900748. Its totient is φ = 19900746.

The previous prime is 19900739. The next prime is 19900753. The reversal of 19900747 is 74700991.

It is a strong prime.

It is an emirp because it is prime and its reverse (74700991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19900747 - 2³ = 19900739 is a prime.

It is not a weakly prime, because it can be changed into another prime (19900717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950373 + 9950374.

It is an arithmetic number, because the mean of its divisors is an integer number (9950374).

Almost surely, 2^19900747 is an apocalyptic number.

19900747 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900747 is an equidigital number, since it uses as much as digits as its factorization.

19900747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 19900747 is about 4461.0253305714. The cubic root of 19900747 is about 270.9919933365.

The spelling of 19900747 in words is "nineteen million, nine hundred thousand, seven hundred forty-seven".