20401420452 has 96 divisors (see below), whose sum is σ = 57720563712. Its totient is φ = 5474996736.

The previous prime is 20401420397. The next prime is 20401420513. The reversal of 20401420452 is 25402410402.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 704083 + ... + 732485.

It is an arithmetic number, because the mean of its divisors is an integer number (601255872).

Almost surely, 2^20401420452 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 20401420452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28860281856).

20401420452 is an abundant number, since it is smaller than the sum of its proper divisors (37319143260).

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

20401420452 is a wasteful number, since it uses less digits than its factorization.

20401420452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28937 (or 28935 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

Adding to 20401420452 its reverse (25402410402), we get a palindrome (45803830854).

The spelling of 20401420452 in words is "twenty billion, four hundred one million, four hundred twenty thousand, four hundred fifty-two".