20257947248 has 80 divisors (see below), whose sum is σ = 49554447360. Its totient is φ = 7792761600.

The previous prime is 20257947233. The next prime is 20257947257. The reversal of 20257947248 is 84274975202.

It is a junction number, because it is equal to n+sod(n) for n = 20257947196 and 20257947205.

It is a congruent number.

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, 6743 + ... + 201398.

It is an arithmetic number, because the mean of its divisors is an integer number (619430592).

Almost surely, 2^20257947248 is an apocalyptic number.

20257947248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20257947248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24777223680).

20257947248 is an abundant number, since it is smaller than the sum of its proper divisors (29296500112).

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

20257947248 is a wasteful number, since it uses less digits than its factorization.

20257947248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208246 (or 208240 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 50.

The spelling of 20257947248 in words is "twenty billion, two hundred fifty-seven million, nine hundred forty-seven thousand, two hundred forty-eight".