20503157345 has 8 divisors (see below), whose sum is σ = 26840496960. Its totient is φ = 14911387120.

The previous prime is 20503157341. The next prime is 20503157347. The reversal of 20503157345 is 54375130502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20503157345 - 2² = 20503157341 is a prime.

It is a super-2 number, since 2×20503157345² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20503157341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186392285 + ... + 186392394.

It is an arithmetic number, because the mean of its divisors is an integer number (3355062120).

Almost surely, 2^20503157345 is an apocalyptic number.

It is an amenable number.

20503157345 is a deficient number, since it is larger than the sum of its proper divisors (6337339615).

20503157345 is a wasteful number, since it uses less digits than its factorization.

20503157345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372784695.

The product of its (nonzero) digits is 63000, while the sum is 35.

Adding to 20503157345 its reverse (54375130502), we get a palindrome (74878287847).

The spelling of 20503157345 in words is "twenty billion, five hundred three million, one hundred fifty-seven thousand, three hundred forty-five".