19906925 has 12 divisors (see below), whose sum is σ = 25352916. Its totient is φ = 15494400.

The previous prime is 19906907. The next prime is 19906933. The reversal of 19906925 is 52960991.

It can be written as a sum of positive squares in 6 ways, for example, as 175561 + 19731364 = 419^2 + 4442^2 .

It is not a de Polignac number, because 19906925 - 2¹² = 19902829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9836 + ... + 11685.

It is an arithmetic number, because the mean of its divisors is an integer number (2112743).

Almost surely, 2^19906925 is an apocalyptic number.

It is an amenable number.

19906925 is a deficient number, since it is larger than the sum of its proper divisors (5445991).

19906925 is a wasteful number, since it uses less digits than its factorization.

19906925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21568 (or 21563 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 19906925 is about 4461.7177185474. The cubic root of 19906925 is about 271.0200327416.

The spelling of 19906925 in words is "nineteen million, nine hundred six thousand, nine hundred twenty-five".