20552445757 has 4 divisors (see below), whose sum is σ = 20841916896. Its totient is φ = 20262974620.

The previous prime is 20552445743. The next prime is 20552445761. The reversal of 20552445757 is 75754425502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20552445757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20552445737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144735463 + ... + 144735604.

It is an arithmetic number, because the mean of its divisors is an integer number (5210479224).

Almost surely, 2^20552445757 is an apocalyptic number.

It is an amenable number.

20552445757 is a deficient number, since it is larger than the sum of its proper divisors (289471139).

20552445757 is an equidigital number, since it uses as much as digits as its factorization.

20552445757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289471138.

The product of its (nonzero) digits is 1960000, while the sum is 46.

The spelling of 20552445757 in words is "twenty billion, five hundred fifty-two million, four hundred forty-five thousand, seven hundred fifty-seven".