19900881 has 72 divisors (see below), whose sum is σ = 39434304. Its totient is φ = 9339840.

The previous prime is 19900831. The next prime is 19900891. The reversal of 19900881 is 18800991.

It is not a de Polignac number, because 19900881 - 2⁶ = 19900817 is a prime.

It is a super-2 number, since 2×19900881² = 792090129152322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19900801) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 423400 + ... + 423446.

Almost surely, 2^19900881 is an apocalyptic number.

19900881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19900881 is a deficient number, since it is larger than the sum of its proper divisors (19533423).

19900881 is a wasteful number, since it uses less digits than its factorization.

19900881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 19900881 is about 4461.0403495149. The cubic root of 19900881 is about 270.9926015691.

The spelling of 19900881 in words is "nineteen million, nine hundred thousand, eight hundred eighty-one".