20420307140 has 48 divisors (see below), whose sum is σ = 44140142592. Its totient is φ = 7931339136.

The previous prime is 20420307139. The next prime is 20420307203. The reversal of 20420307140 is 4170302402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33854 + ... + 204906.

It is an arithmetic number, because the mean of its divisors is an integer number (919586304).

Almost surely, 2^20420307140 is an apocalyptic number.

20420307140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20420307140 is an abundant number, since it is smaller than the sum of its proper divisors (23719835452).

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

20420307140 is a wasteful number, since it uses less digits than its factorization.

20420307140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171236 (or 171234 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

Adding to 20420307140 its reverse (4170302402), we get a palindrome (24590609542).

The spelling of 20420307140 in words is "twenty billion, four hundred twenty million, three hundred seven thousand, one hundred forty".