19919020 has 36 divisors (see below), whose sum is σ = 45983952. Its totient is φ = 7242400.

The previous prime is 19919017. The next prime is 19919041. The reversal of 19919020 is 2091991.

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, 1696 + ... + 6535.

It is an arithmetic number, because the mean of its divisors is an integer number (1277332).

Almost surely, 2^19919020 is an apocalyptic number.

19919020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19919020 is an abundant number, since it is smaller than the sum of its proper divisors (26064932).

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

19919020 is a wasteful number, since it uses less digits than its factorization.

19919020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8262 (or 8249 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 19919020 is about 4463.0729324088. The cubic root of 19919020 is about 271.0749101882.

It can be divided in two parts, 1991 and 9020, that added together give a palindrome (11011).

The spelling of 19919020 in words is "nineteen million, nine hundred nineteen thousand, twenty".