20420040000 has 140 divisors (see below), whose sum is σ = 67513813664. Its totient is φ = 5445312000.

The previous prime is 20420039989. The next prime is 20420040013. The reversal of 20420040000 is 4002402.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34917 + ... + 205083.

Almost surely, 2^20420040000 is an apocalyptic number.

20420040000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20420040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33756906832).

20420040000 is an abundant number, since it is smaller than the sum of its proper divisors (47093773664).

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

20420040000 is an equidigital number, since it uses as much as digits as its factorization.

20420040000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170202 (or 170177 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

Adding to 20420040000 its reverse (4002402), we get a palindrome (20424042402).

The spelling of 20420040000 in words is "twenty billion, four hundred twenty million, forty thousand".