20451420453544 has 32 divisors (see below), whose sum is σ = 38559546010440. Its totient is φ = 10168878585600.

The previous prime is 20451420453511. The next prime is 20451420453577. The reversal of 20451420453544 is 44535402415402.

It is an interprime number because it is at equal distance from previous prime (20451420453511) and next prime (20451420453577).

It can be written as a sum of positive squares in 4 ways, for example, as 2764870584100 + 17686549869444 = 1662790^2 + 4205538^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20451420453544.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46890714 + ... + 47324854.

Almost surely, 2^{20451420453544} is an apocalyptic number.

It is an amenable number.

20451420453544 is a deficient number, since it is larger than the sum of its proper divisors (18108125556896).

20451420453544 is a wasteful number, since it uses less digits than its factorization.

20451420453544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466861 (or 466857 counting only the distinct ones).

The product of its (nonzero) digits is 1536000, while the sum is 43.

Adding to 20451420453544 its reverse (44535402415402), we get a palindrome (64986822868946).

The spelling of 20451420453544 in words is "twenty trillion, four hundred fifty-one billion, four hundred twenty million, four hundred fifty-three thousand, five hundred forty-four".