20603149405 has 16 divisors (see below), whose sum is σ = 26184466944. Its totient is φ = 15509198080.

The previous prime is 20603149397. The next prime is 20603149409. The reversal of 20603149405 is 50494130602.

It is a happy number.

It is not a de Polignac number, because 20603149405 - 2³ = 20603149397 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 (20603149409) 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, 352200 + ... + 406510.

It is an arithmetic number, because the mean of its divisors is an integer number (1636529184).

Almost surely, 2^20603149405 is an apocalyptic number.

It is an amenable number.

20603149405 is a deficient number, since it is larger than the sum of its proper divisors (5581317539).

20603149405 is a wasteful number, since it uses less digits than its factorization.

20603149405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58796.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 20603149405 in words is "twenty billion, six hundred three million, one hundred forty-nine thousand, four hundred five".