20355149357 has 4 divisors (see below), whose sum is σ = 20399304156. Its totient is φ = 20310994560.

The previous prime is 20355149303. The next prime is 20355149383. The reversal of 20355149357 is 75394155302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75394155302 = 2 ⋅37697077651.

It can be written as a sum of positive squares in 2 ways, for example, as 12092521156 + 8262628201 = 109966^2 + 90899^2 .

It is a cyclic number.

It is not a de Polignac number, because 20355149357 - 2¹⁸ = 20354887213 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 (20355140357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22076708 + ... + 22077629.

It is an arithmetic number, because the mean of its divisors is an integer number (5099826039).

Almost surely, 2^20355149357 is an apocalyptic number.

It is an amenable number.

20355149357 is a deficient number, since it is larger than the sum of its proper divisors (44154799).

20355149357 is an equidigital number, since it uses as much as digits as its factorization.

20355149357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44154798.

The product of its (nonzero) digits is 567000, while the sum is 44.

The spelling of 20355149357 in words is "twenty billion, three hundred fifty-five million, one hundred forty-nine thousand, three hundred fifty-seven".