20015920 has 20 divisors (see below), whose sum is σ = 46537200. Its totient is φ = 8006336.

The previous prime is 20015917. The next prime is 20015921. The reversal of 20015920 is 2951002.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (20015921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125020 + ... + 125179.

It is an arithmetic number, because the mean of its divisors is an integer number (2326860).

Almost surely, 2^20015920 is an apocalyptic number.

20015920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20015920 is an abundant number, since it is smaller than the sum of its proper divisors (26521280).

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

20015920 is a wasteful number, since it uses less digits than its factorization.

20015920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250212 (or 250206 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 20015920 is about 4473.9155110485. The cubic root of 20015920 is about 271.5137651054.

Adding to 20015920 its reverse (2951002), we get a palindrome (22966922).

It can be divided in two parts, 2001 and 5920, that added together give a square (7921 = 89²).

The spelling of 20015920 in words is "twenty million, fifteen thousand, nine hundred twenty".