20012155451 has 4 divisors (see below), whose sum is σ = 20021637504. Its totient is φ = 20002673400.

The previous prime is 20012155447. The next prime is 20012155463. The reversal of 20012155451 is 15455121002.

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 20012155451 - 2² = 20012155447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20012155451.

It is not an unprimeable number, because it can be changed into a prime (20012155411) 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, 4737860 + ... + 4742081.

It is an arithmetic number, because the mean of its divisors is an integer number (5005409376).

Almost surely, 2^20012155451 is an apocalyptic number.

20012155451 is a deficient number, since it is larger than the sum of its proper divisors (9482053).

20012155451 is an equidigital number, since it uses as much as digits as its factorization.

20012155451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9482052.

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 20012155451 its reverse (15455121002), we get a palindrome (35467276453).

The spelling of 20012155451 in words is "twenty billion, twelve million, one hundred fifty-five thousand, four hundred fifty-one".