20253134391 has 16 divisors (see below), whose sum is σ = 31518557184. Its totient is φ = 11326980384.

The previous prime is 20253134389. The next prime is 20253134401. The reversal of 20253134391 is 19343135202.

It is not a de Polignac number, because 20253134391 - 2¹ = 20253134389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20253134791) 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, 10258960 + ... + 10260933.

It is an arithmetic number, because the mean of its divisors is an integer number (1969909824).

Almost surely, 2^20253134391 is an apocalyptic number.

20253134391 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20253134391 is a deficient number, since it is larger than the sum of its proper divisors (11265422793).

20253134391 is a wasteful number, since it uses less digits than its factorization.

20253134391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20519950.

The product of its (nonzero) digits is 19440, while the sum is 33.

Adding to 20253134391 its reverse (19343135202), we get a palindrome (39596269593).

The spelling of 20253134391 in words is "twenty billion, two hundred fifty-three million, one hundred thirty-four thousand, three hundred ninety-one".