20020400442 has 48 divisors (see below), whose sum is σ = 49583788800. Its totient is φ = 5719022496.

The previous prime is 20020400429. The next prime is 20020400459. The reversal of 20020400442 is 24400402002.

20020400442 is a `hidden beast` number, since 20 + 0 + 204 + 0 + 0 + 442 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 836559 + ... + 860157.

It is an arithmetic number, because the mean of its divisors is an integer number (1032995600).

Almost surely, 2^20020400442 is an apocalyptic number.

20020400442 is an abundant number, since it is smaller than the sum of its proper divisors (29563388358).

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

20020400442 is a wasteful number, since it uses less digits than its factorization.

20020400442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30347 (or 30344 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

Adding to 20020400442 its reverse (24400402002), we get a palindrome (44420802444).

The spelling of 20020400442 in words is "twenty billion, twenty million, four hundred thousand, four hundred forty-two".