20355440527 has 2 divisors, whose sum is σ = 20355440528. Its totient is φ = 20355440526.

The previous prime is 20355440507. The next prime is 20355440531. The reversal of 20355440527 is 72504455302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20355440527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20355440507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177720263 + 10177720264.

It is an arithmetic number, because the mean of its divisors is an integer number (10177720264).

Almost surely, 2^20355440527 is an apocalyptic number.

20355440527 is a deficient number, since it is larger than the sum of its proper divisors (1).

20355440527 is an equidigital number, since it uses as much as digits as its factorization.

20355440527 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168000, while the sum is 37.

Adding to 20355440527 its reverse (72504455302), we get a palindrome (92859895829).

The spelling of 20355440527 in words is "twenty billion, three hundred fifty-five million, four hundred forty thousand, five hundred twenty-seven".