20857425241 has 9 divisors (see below), whose sum is σ = 21028797621. Its totient is φ = 20687441724.

The previous prime is 20857425181. The next prime is 20857425247. The reversal of 20857425241 is 14252475802.

It is a happy number.

The square root of 20857425241 is 144421.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 20857425241 - 2²⁹ = 20320554329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20857425194 and 20857425203.

It is not an unprimeable number, because it can be changed into a prime (20857425247) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20074000 + ... + 20075038.

It is an arithmetic number, because the mean of its divisors is an integer number (2336533069).

Almost surely, 2^20857425241 is an apocalyptic number.

20857425241 is the 144421-st square number.

20857425241 is the 72211-st centered octagonal number.

It is an amenable number.

20857425241 is a deficient number, since it is larger than the sum of its proper divisors (171372380).

20857425241 is an frugal number, since it uses more digits than its factorization.

20857425241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356 (or 1178 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 40.

The spelling of 20857425241 in words is "twenty billion, eight hundred fifty-seven million, four hundred twenty-five thousand, two hundred forty-one".