20503157405 has 16 divisors (see below), whose sum is σ = 24664941504. Its totient is φ = 16361809920.

The previous prime is 20503157399. The next prime is 20503157407. The reversal of 20503157405 is 50475130502.

It is not a de Polignac number, because 20503157405 - 2⁶ = 20503157341 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 (20503157407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4571294 + ... + 4575776.

It is an arithmetic number, because the mean of its divisors is an integer number (1541558844).

Almost surely, 2^20503157405 is an apocalyptic number.

It is an amenable number.

20503157405 is a deficient number, since it is larger than the sum of its proper divisors (4161784099).

20503157405 is a wasteful number, since it uses less digits than its factorization.

20503157405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6556.

The product of its (nonzero) digits is 21000, while the sum is 32.

Adding to 20503157405 its reverse (50475130502), we get a palindrome (70978287907).

The spelling of 20503157405 in words is "twenty billion, five hundred three million, one hundred fifty-seven thousand, four hundred five".