19925881 has 2 divisors, whose sum is σ = 19925882. Its totient is φ = 19925880.

The previous prime is 19925879. The next prime is 19925897. The reversal of 19925881 is 18852991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18844281 + 1081600 = 4341^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 19925881 - 2¹ = 19925879 is a prime.

It is a super-2 number, since 2×19925881² = 794081467252322, which contains 22 as substring.

Together with 19925879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19925831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9962940 + 9962941.

It is an arithmetic number, because the mean of its divisors is an integer number (9962941).

Almost surely, 2^19925881 is an apocalyptic number.

It is an amenable number.

19925881 is a deficient number, since it is larger than the sum of its proper divisors (1).

19925881 is an equidigital number, since it uses as much as digits as its factorization.

19925881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 43.

The square root of 19925881 is about 4463.8415070430. The cubic root of 19925881 is about 271.1060300502.

The spelling of 19925881 in words is "nineteen million, nine hundred twenty-five thousand, eight hundred eighty-one".