2001554520 has 64 divisors (see below), whose sum is σ = 6862475520. Its totient is φ = 457497984.

The previous prime is 2001554501. The next prime is 2001554521. The reversal of 2001554520 is 254551002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001554521) 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, 1190562 + ... + 1192241.

It is an arithmetic number, because the mean of its divisors is an integer number (107226180).

Almost surely, 2^2001554520 is an apocalyptic number.

2001554520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001554520 is an abundant number, since it is smaller than the sum of its proper divisors (4860921000).

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

2001554520 is a wasteful number, since it uses less digits than its factorization.

2001554520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382824 (or 2382820 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 2001554520 is about 44738.7362360628. The cubic root of 2001554520 is about 1260.2473941031.

The spelling of 2001554520 in words is "two billion, one million, five hundred fifty-four thousand, five hundred twenty".