20857272140 has 24 divisors (see below), whose sum is σ = 43825246080. Its totient is φ = 8338151808.

The previous prime is 20857272113. The next prime is 20857272169. The reversal of 20857272140 is 4127275802.

It is a super-2 number, since 2×20857272140² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20857272094 and 20857272103.

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, 261257 + ... + 331616.

It is an arithmetic number, because the mean of its divisors is an integer number (1826051920).

Almost surely, 2^20857272140 is an apocalyptic number.

20857272140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20857272140 is an abundant number, since it is smaller than the sum of its proper divisors (22967973940).

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

20857272140 is a wasteful number, since it uses less digits than its factorization.

20857272140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594641 (or 594639 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 38.

The spelling of 20857272140 in words is "twenty billion, eight hundred fifty-seven million, two hundred seventy-two thousand, one hundred forty".