20049920 has 104 divisors (see below), whose sum is σ = 53077680. Its totient is φ = 7208960.

The previous prime is 20049917. The next prime is 20049937. The reversal of 20049920 is 2994002.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20049920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225236 + ... + 225324.

Almost surely, 2^20049920 is an apocalyptic number.

20049920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20049920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26538840).

20049920 is an abundant number, since it is smaller than the sum of its proper divisors (33027760).

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

20049920 is an equidigital number, since it uses as much as digits as its factorization.

20049920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 20049920 is about 4477.7137023262. The cubic root of 20049920 is about 271.6674135668.

The spelling of 20049920 in words is "twenty million, forty-nine thousand, nine hundred twenty".