20903040 has 192 divisors, whose sum is σ = 76377600. Its totient is φ = 5253120.

The previous prime is 20903027. The next prime is 20903089. The reversal of 20903040 is 4030902.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109345 + ... + 109535.

It is an arithmetic number, because the mean of its divisors is an integer number (397800).

Almost surely, 2^20903040 is an apocalyptic number.

20903040 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 20903040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38188800).

20903040 is an abundant number, since it is smaller than the sum of its proper divisors (55474560).

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

20903040 is a wasteful number, since it uses less digits than its factorization.

20903040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20903040 is about 4571.9842519414. The cubic root of 20903040 is about 275.4671508908.

Adding to 20903040 its reverse (4030902), we get a palindrome (24933942).

The spelling of 20903040 in words is "twenty million, nine hundred three thousand, forty".