20757257448 has 64 divisors (see below), whose sum is σ = 54970125120. Its totient is φ = 6509184000.

The previous prime is 20757257447. The next prime is 20757257461. The reversal of 20757257448 is 84475275702.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 20757257448.

It is not an unprimeable number, because it can be changed into a prime (20757257447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1022598 + ... + 1042698.

It is an arithmetic number, because the mean of its divisors is an integer number (858908205).

Almost surely, 2^20757257448 is an apocalyptic number.

It is an amenable number.

20757257448 is an abundant number, since it is smaller than the sum of its proper divisors (34212867672).

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

20757257448 is a wasteful number, since it uses less digits than its factorization.

20757257448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22658 (or 22654 counting only the distinct ones).

The product of its (nonzero) digits is 4390400, while the sum is 51.

The spelling of 20757257448 in words is "twenty billion, seven hundred fifty-seven million, two hundred fifty-seven thousand, four hundred forty-eight".