20225840 has 20 divisors (see below), whose sum is σ = 47025264. Its totient is φ = 8090304.

The previous prime is 20225837. The next prime is 20225851. The reversal of 20225840 is 4852202.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126332 + ... + 126491.

Almost surely, 2^20225840 is an apocalyptic number.

20225840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20225840 is an abundant number, since it is smaller than the sum of its proper divisors (26799424).

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

20225840 is a wasteful number, since it uses less digits than its factorization.

20225840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252836 (or 252830 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 20225840 is about 4497.3147543840. The cubic root of 20225840 is about 272.4596466913.

The spelling of 20225840 in words is "twenty million, two hundred twenty-five thousand, eight hundred forty".