20545143451 has 4 divisors (see below), whose sum is σ = 23480163952. Its totient is φ = 17610122952.

The previous prime is 20545143449. The next prime is 20545143469. The reversal of 20545143451 is 15434154502.

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 20545143451 - 2¹ = 20545143449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20545143551) 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, 1467510240 + ... + 1467510253.

It is an arithmetic number, because the mean of its divisors is an integer number (5870040988).

Almost surely, 2^20545143451 is an apocalyptic number.

20545143451 is a deficient number, since it is larger than the sum of its proper divisors (2935020501).

20545143451 is an equidigital number, since it uses as much as digits as its factorization.

20545143451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2935020500.

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 20545143451 its reverse (15434154502), we get a palindrome (35979297953).

The spelling of 20545143451 in words is "twenty billion, five hundred forty-five million, one hundred forty-three thousand, four hundred fifty-one".