20855342140 has 12 divisors (see below), whose sum is σ = 43796218536. Its totient is φ = 8342136848.

The previous prime is 20855342107. The next prime is 20855342147. The reversal of 20855342140 is 4124355802.

It is a junction number, because it is equal to n+sod(n) for n = 20855342096 and 20855342105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855342147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521383534 + ... + 521383573.

It is an arithmetic number, because the mean of its divisors is an integer number (3649684878).

Almost surely, 2^20855342140 is an apocalyptic number.

20855342140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20855342140 is an abundant number, since it is smaller than the sum of its proper divisors (22940876396).

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

20855342140 is a wasteful number, since it uses less digits than its factorization.

20855342140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042767116 (or 1042767114 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

Adding to 20855342140 its reverse (4124355802), we get a palindrome (24979697942).

The spelling of 20855342140 in words is "twenty billion, eight hundred fifty-five million, three hundred forty-two thousand, one hundred forty".