451501020 has 96 divisors (see below), whose sum is σ = 1439000640. Its totient is φ = 117457920.

The previous prime is 451501013. The next prime is 451501021. The reversal of 451501020 is 20105154.

It is a super-2 number, since 2×451501020² = 407706342122080800, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 451500984 and 451501002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451501021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11944 + ... + 32336.

It is an arithmetic number, because the mean of its divisors is an integer number (14989590).

Almost surely, 2^451501020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 451501020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (719500320).

451501020 is an abundant number, since it is smaller than the sum of its proper divisors (987499620).

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

451501020 is a wasteful number, since it uses less digits than its factorization.

451501020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20452 (or 20444 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 451501020 is about 21248.5533625233. The cubic root of 451501020 is about 767.1605207113.

Adding to 451501020 its reverse (20105154), we get a palindrome (471606174).

The spelling of 451501020 in words is "four hundred fifty-one million, five hundred one thousand, twenty".