19923888 has 40 divisors (see below), whose sum is σ = 53710848. Its totient is φ = 6352192.

The previous prime is 19923859. The next prime is 19923889. The reversal of 19923888 is 88832991.

It is a happy number.

It is a super-2 number, since 2×19923888² = 793922626073088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (19923889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7920 + ... + 10127.

Almost surely, 2^19923888 is an apocalyptic number.

It is an amenable number.

19923888 is an abundant number, since it is smaller than the sum of its proper divisors (33786960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19923888 is a wasteful number, since it uses less digits than its factorization.

19923888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18081 (or 18075 counting only the distinct ones).

The product of its digits is 248832, while the sum is 48.

The square root of 19923888 is about 4463.6182632479. The cubic root of 19923888 is about 271.0969910131.

The spelling of 19923888 in words is "nineteen million, nine hundred twenty-three thousand, eight hundred eighty-eight".