2001254420 has 48 divisors (see below), whose sum is σ = 4826001600. Its totient is φ = 689425920.

The previous prime is 2001254413. The next prime is 2001254429. The reversal of 2001254420 is 244521002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2001254392 and 2001254401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001254429) 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, 235205 + ... + 243564.

It is an arithmetic number, because the mean of its divisors is an integer number (100541700).

Almost surely, 2^2001254420 is an apocalyptic number.

2001254420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001254420 is an abundant number, since it is smaller than the sum of its proper divisors (2824747180).

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

2001254420 is a wasteful number, since it uses less digits than its factorization.

2001254420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478808 (or 478806 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 2001254420 is about 44735.3821935166. The cubic root of 2001254420 is about 1260.1844065365.

Adding to 2001254420 its reverse (244521002), we get a palindrome (2245775422).

The spelling of 2001254420 in words is "two billion, one million, two hundred fifty-four thousand, four hundred twenty".