451520020 has 24 divisors (see below), whose sum is σ = 1083648384. Its totient is φ = 154806816.

The previous prime is 451520011. The next prime is 451520029. The reversal of 451520020 is 20025154.

It is an interprime number because it is at equal distance from previous prime (451520011) and next prime (451520029).

It is a self number, because there is not a number n which added to its sum of digits gives 451520020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451520029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1612432 + ... + 1612711.

It is an arithmetic number, because the mean of its divisors is an integer number (45152016).

Almost surely, 2^451520020 is an apocalyptic number.

It is an amenable number.

451520020 is an abundant number, since it is smaller than the sum of its proper divisors (632128364).

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

451520020 is a wasteful number, since it uses less digits than its factorization.

451520020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3225159 (or 3225157 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 451520020 is about 21249.0004470799. Note that the first 3 decimals coincide. The cubic root of 451520020 is about 767.1712817394.

Subtracting from 451520020 its sum of digits (19), we obtain a square (451520001 = 21249²).

Adding to 451520020 its reverse (20025154), we get a palindrome (471545174).

The spelling of 451520020 in words is "four hundred fifty-one million, five hundred twenty thousand, twenty".