20452020 has 48 divisors (see below), whose sum is σ = 60637248. Its totient is φ = 5132800.

The previous prime is 20452007. The next prime is 20452021. The reversal of 20452020 is 2025402.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20452021) 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, 9006 + ... + 11045.

It is an arithmetic number, because the mean of its divisors is an integer number (1263276).

Almost surely, 2^20452020 is an apocalyptic number.

20452020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20452020 is an abundant number, since it is smaller than the sum of its proper divisors (40185228).

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

20452020 is a wasteful number, since it uses less digits than its factorization.

20452020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20080 (or 20078 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 20452020 is about 4522.3909605429. The cubic root of 20452020 is about 273.4714979985.

Adding to 20452020 its reverse (2025402), we get a palindrome (22477422).

The spelling of 20452020 in words is "twenty million, four hundred fifty-two thousand, twenty".