19906971 has 16 divisors (see below), whose sum is σ = 30407424. Its totient is φ = 11348064.

The previous prime is 19906967. The next prime is 19906981. The reversal of 19906971 is 17960991.

It is not a de Polignac number, because 19906971 - 2² = 19906967 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19906951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10621 + ... + 12353.

It is an arithmetic number, because the mean of its divisors is an integer number (1900464).

Almost surely, 2^19906971 is an apocalyptic number.

19906971 is a deficient number, since it is larger than the sum of its proper divisors (10500453).

19906971 is a wasteful number, since it uses less digits than its factorization.

19906971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290.

The product of its (nonzero) digits is 30618, while the sum is 42.

The square root of 19906971 is about 4461.7228735097. The cubic root of 19906971 is about 271.0202414949.

The spelling of 19906971 in words is "nineteen million, nine hundred six thousand, nine hundred seventy-one".