20603645877349 has 16 divisors (see below), whose sum is σ = 21586423169536. Its totient is φ = 19640772043200.

The previous prime is 20603645877257. The next prime is 20603645877361. The reversal of 20603645877349 is 94377854630602.

It is a cyclic number.

It is not a de Polignac number, because 20603645877349 - 2¹⁹ = 20603645353061 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 (20633645877349) 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, 70765579 + ... + 71056135.

It is an arithmetic number, because the mean of its divisors is an integer number (1349151448096).

Almost surely, 2^{20603645877349} is an apocalyptic number.

It is an amenable number.

20603645877349 is a deficient number, since it is larger than the sum of its proper divisors (982777292187).

20603645877349 is a wasteful number, since it uses less digits than its factorization.

20603645877349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324796.

The product of its (nonzero) digits is 182891520, while the sum is 64.

The spelling of 20603645877349 in words is "twenty trillion, six hundred three billion, six hundred forty-five million, eight hundred seventy-seven thousand, three hundred forty-nine".