19939020 has 24 divisors (see below), whose sum is σ = 55829424. Its totient is φ = 5317056.

The previous prime is 19939013. The next prime is 19939021. The reversal of 19939020 is 2093991.

It is not an unprimeable number, because it can be changed into a prime (19939021) 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, 166099 + ... + 166218.

It is an arithmetic number, because the mean of its divisors is an integer number (2326226).

Almost surely, 2^19939020 is an apocalyptic number.

19939020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19939020 is an abundant number, since it is smaller than the sum of its proper divisors (35890404).

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

19939020 is a wasteful number, since it uses less digits than its factorization.

19939020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332329 (or 332327 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 19939020 is about 4465.3129789523. The cubic root of 19939020 is about 271.1656054919.

The spelling of 19939020 in words is "nineteen million, nine hundred thirty-nine thousand, twenty".