19902069 has 12 divisors (see below), whose sum is σ = 31360992. Its totient is φ = 12061800.

The previous prime is 19902067. The next prime is 19902073. The reversal of 19902069 is 96020991.

It is not a de Polignac number, because 19902069 - 2¹ = 19902067 is a prime.

It is a super-2 number, since 2×19902069² = 792184700961522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19902067) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100417 + ... + 100614.

It is an arithmetic number, because the mean of its divisors is an integer number (2613416).

Almost surely, 2^19902069 is an apocalyptic number.

It is an amenable number.

19902069 is a deficient number, since it is larger than the sum of its proper divisors (11458923).

19902069 is a wasteful number, since it uses less digits than its factorization.

19902069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201048 (or 201045 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 19902069 is about 4461.1735003248. The cubic root of 19902069 is about 270.9979938396.

The spelling of 19902069 in words is "nineteen million, nine hundred two thousand, sixty-nine".