20154120506 has 32 divisors (see below), whose sum is σ = 32810738688. Its totient is φ = 9229587840.

The previous prime is 20154120491. The next prime is 20154120509. The reversal of 20154120506 is 60502145102.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (20154120509) 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, 1797590 + ... + 1808766.

It is an arithmetic number, because the mean of its divisors is an integer number (1025335584).

Almost surely, 2^20154120506 is an apocalyptic number.

20154120506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20154120506 is a deficient number, since it is larger than the sum of its proper divisors (12656618182).

20154120506 is a wasteful number, since it uses less digits than its factorization.

20154120506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11726.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 20154120506 its reverse (60502145102), we get a palindrome (80656265608).

The spelling of 20154120506 in words is "twenty billion, one hundred fifty-four million, one hundred twenty thousand, five hundred six".