20553434151451 has 4 divisors (see below), whose sum is σ = 20941234795872. Its totient is φ = 20165633507032.

The previous prime is 20553434151431. The next prime is 20553434151473. The reversal of 20553434151451 is 15415143435502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20553434151451 - 2¹³ = 20553434143259 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20553434151398 and 20553434151407.

It is not an unprimeable number, because it can be changed into a prime (20553434151431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193900322131 + ... + 193900322236.

It is an arithmetic number, because the mean of its divisors is an integer number (5235308698968).

Almost surely, 2^{20553434151451} is an apocalyptic number.

20553434151451 is a deficient number, since it is larger than the sum of its proper divisors (387800644421).

20553434151451 is an equidigital number, since it uses as much as digits as its factorization.

20553434151451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387800644420.

The product of its (nonzero) digits is 720000, while the sum is 43.

Adding to 20553434151451 its reverse (15415143435502), we get a palindrome (35968577586953).

The spelling of 20553434151451 in words is "twenty trillion, five hundred fifty-three billion, four hundred thirty-four million, one hundred fifty-one thousand, four hundred fifty-one".