20415001551 has 8 divisors (see below), whose sum is σ = 31108573824. Its totient is φ = 11665715160.

The previous prime is 20415001513. The next prime is 20415001553. The reversal of 20415001551 is 15510051402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20415001551 - 2⁹ = 20415001039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415001553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486071445 + ... + 486071486.

It is an arithmetic number, because the mean of its divisors is an integer number (3888571728).

Almost surely, 2^20415001551 is an apocalyptic number.

20415001551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20415001551 is a deficient number, since it is larger than the sum of its proper divisors (10693572273).

20415001551 is an equidigital number, since it uses as much as digits as its factorization.

20415001551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972142941.

The product of its (nonzero) digits is 1000, while the sum is 24.

Adding to 20415001551 its reverse (15510051402), we get a palindrome (35925052953).

The spelling of 20415001551 in words is "twenty billion, four hundred fifteen million, one thousand, five hundred fifty-one".