20502153351 has 8 divisors (see below), whose sum is σ = 30373560560. Its totient is φ = 13668102216.

The previous prime is 20502153349. The next prime is 20502153359. The reversal of 20502153351 is 15335120502.

It is a happy number.

20502153351 is a `hidden beast` number, since 2 + 0 + 502 + 153 + 3 + 5 + 1 = 666.

It is not a de Polignac number, because 20502153351 - 2¹ = 20502153349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 759339013 = 20502153351 / (2 + 0 + 5 + 0 + 2 + 1 + 5 + 3 + 3 + 5 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502153359) 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, 379669480 + ... + 379669533.

It is an arithmetic number, because the mean of its divisors is an integer number (3796695070).

Almost surely, 2^20502153351 is an apocalyptic number.

20502153351 is a deficient number, since it is larger than the sum of its proper divisors (9871407209).

20502153351 is an equidigital number, since it uses as much as digits as its factorization.

20502153351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759339022 (or 759339016 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

Adding to 20502153351 its reverse (15335120502), we get a palindrome (35837273853).

The spelling of 20502153351 in words is "twenty billion, five hundred two million, one hundred fifty-three thousand, three hundred fifty-one".