20420133140 has 24 divisors (see below), whose sum is σ = 46780669152. Its totient is φ = 7425502880.

The previous prime is 20420133133. The next prime is 20420133191. The reversal of 20420133140 is 4133102402.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46409174 + ... + 46409613.

It is an arithmetic number, because the mean of its divisors is an integer number (1949194548).

Almost surely, 2^20420133140 is an apocalyptic number.

20420133140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20420133140 is an abundant number, since it is smaller than the sum of its proper divisors (26360536012).

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

20420133140 is a wasteful number, since it uses less digits than its factorization.

20420133140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92818807 (or 92818805 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20420133140 its reverse (4133102402), we get a palindrome (24553235542).

The spelling of 20420133140 in words is "twenty billion, four hundred twenty million, one hundred thirty-three thousand, one hundred forty".