20748287957 has 2 divisors, whose sum is σ = 20748287958. Its totient is φ = 20748287956.

The previous prime is 20748287929. The next prime is 20748288013. The reversal of 20748287957 is 75978284702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20417266321 + 331021636 = 142889^2 + 18194^2 .

It is a cyclic number.

It is not a de Polignac number, because 20748287957 - 2¹⁸ = 20748025813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20748287896 and 20748287905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20748287657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10374143978 + 10374143979.

It is an arithmetic number, because the mean of its divisors is an integer number (10374143979).

Almost surely, 2^20748287957 is an apocalyptic number.

It is an amenable number.

20748287957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20748287957 is an equidigital number, since it uses as much as digits as its factorization.

20748287957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15805440, while the sum is 59.

The spelling of 20748287957 in words is "twenty billion, seven hundred forty-eight million, two hundred eighty-seven thousand, nine hundred fifty-seven".