20451120 has 40 divisors (see below), whose sum is σ = 63399216. Its totient is φ = 5453568.

The previous prime is 20451113. The next prime is 20451127. The reversal of 20451120 is 2115402.

It is an interprime number because it is at equal distance from previous prime (20451113) and next prime (20451127).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20451120.

It is not an unprimeable number, because it can be changed into a prime (20451127) 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, 42367 + ... + 42846.

Almost surely, 2^20451120 is an apocalyptic number.

20451120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20451120 is an abundant number, since it is smaller than the sum of its proper divisors (42948096).

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

20451120 is a wasteful number, since it uses less digits than its factorization.

20451120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85229 (or 85223 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 20451120 is about 4522.2914545615. The cubic root of 20451120 is about 273.4674865291.

Adding to 20451120 its reverse (2115402), we get a palindrome (22566522).

The spelling of 20451120 in words is "twenty million, four hundred fifty-one thousand, one hundred twenty".