20120135451 has 32 divisors (see below), whose sum is σ = 29772707328. Its totient is φ = 12007138560.

The previous prime is 20120135449. The next prime is 20120135467. The reversal of 20120135451 is 15453102102.

It is a happy number.

It is not a de Polignac number, because 20120135451 - 2¹ = 20120135449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20120135951) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 229360 + ... + 304706.

It is an arithmetic number, because the mean of its divisors is an integer number (930397104).

Almost surely, 2^20120135451 is an apocalyptic number.

20120135451 is a deficient number, since it is larger than the sum of its proper divisors (9652571877).

20120135451 is a wasteful number, since it uses less digits than its factorization.

20120135451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75571.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 20120135451 its reverse (15453102102), we get a palindrome (35573237553).

The spelling of 20120135451 in words is "twenty billion, one hundred twenty million, one hundred thirty-five thousand, four hundred fifty-one".