20454103515 has 16 divisors (see below), whose sum is σ = 33187504896. Its totient is φ = 10755208800.

The previous prime is 20454103513. The next prime is 20454103517. The reversal of 20454103515 is 51530145402.

It is an interprime number because it is at equal distance from previous prime (20454103513) and next prime (20454103517).

It is not a de Polignac number, because 20454103515 - 2¹ = 20454103513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20454103513) 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, 9601801 + ... + 9603930.

It is an arithmetic number, because the mean of its divisors is an integer number (2074219056).

Almost surely, 2^20454103515 is an apocalyptic number.

20454103515 is a deficient number, since it is larger than the sum of its proper divisors (12733401381).

20454103515 is a wasteful number, since it uses less digits than its factorization.

20454103515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19205810.

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 20454103515 its reverse (51530145402), we get a palindrome (71984248917).

The spelling of 20454103515 in words is "twenty billion, four hundred fifty-four million, one hundred three thousand, five hundred fifteen".