20099940 has 48 divisors (see below), whose sum is σ = 64321152. Its totient is φ = 4594176.

The previous prime is 20099939. The next prime is 20099941. The reversal of 20099940 is 4999002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20099939) and next prime (20099941).

It is not an unprimeable number, because it can be changed into a prime (20099941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23509 + ... + 24348.

It is an arithmetic number, because the mean of its divisors is an integer number (1340024).

Almost surely, 2^20099940 is an apocalyptic number.

20099940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20099940 is an abundant number, since it is smaller than the sum of its proper divisors (44221212).

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

20099940 is a wasteful number, since it uses less digits than its factorization.

20099940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47876 (or 47874 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 20099940 is about 4483.2956627909. The cubic root of 20099940 is about 271.8931421372.

The spelling of 20099940 in words is "twenty million, ninety-nine thousand, nine hundred forty".