19690971 has 16 divisors (see below), whose sum is σ = 27302400. Its totient is φ = 12608288.

The previous prime is 19690961. The next prime is 19690991. The reversal of 19690971 is 17909691.

It is a cyclic number.

It is not a de Polignac number, because 19690971 - 2⁵ = 19690939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19690901) 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, 20320 + ... + 21266.

It is an arithmetic number, because the mean of its divisors is an integer number (1706400).

Almost surely, 2^19690971 is an apocalyptic number.

19690971 is a deficient number, since it is larger than the sum of its proper divisors (7611429).

19690971 is a wasteful number, since it uses less digits than its factorization.

19690971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218.

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

The square root of 19690971 is about 4437.4509574755. The cubic root of 19690971 is about 270.0364422690.

The spelling of 19690971 in words is "nineteen million, six hundred ninety thousand, nine hundred seventy-one".