19908994 has 24 divisors (see below), whose sum is σ = 34933248. Its totient is φ = 8484840.

The previous prime is 19908953. The next prime is 19909061. The reversal of 19908994 is 49980991.

It is a Harshad number since it is a multiple of its sum of digits (49).

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, 21399 + ... + 22309.

It is an arithmetic number, because the mean of its divisors is an integer number (1455552).

Almost surely, 2^19908994 is an apocalyptic number.

19908994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19908994 is a deficient number, since it is larger than the sum of its proper divisors (15024254).

19908994 is a wasteful number, since it uses less digits than its factorization.

19908994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150 (or 1143 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 19908994 is about 4461.9495738970. The cubic root of 19908994 is about 271.0294217862.

It can be divided in two parts, 19908 and 994, that added together give a palindrome (20902).

The spelling of 19908994 in words is "nineteen million, nine hundred eight thousand, nine hundred ninety-four".