20145420454 has 4 divisors (see below), whose sum is σ = 30218130684. Its totient is φ = 10072710226.

The previous prime is 20145420431. The next prime is 20145420457. The reversal of 20145420454 is 45402454102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45402454102 = 2 ⋅22701227051.

It is a super-2 number, since 2×20145420454² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145420457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5036355112 + ... + 5036355115.

It is an arithmetic number, because the mean of its divisors is an integer number (7554532671).

Almost surely, 2^20145420454 is an apocalyptic number.

20145420454 is a deficient number, since it is larger than the sum of its proper divisors (10072710230).

20145420454 is a wasteful number, since it uses less digits than its factorization.

20145420454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10072710229.

The product of its (nonzero) digits is 25600, while the sum is 31.

Adding to 20145420454 its reverse (45402454102), we get a palindrome (65547874556).

The spelling of 20145420454 in words is "twenty billion, one hundred forty-five million, four hundred twenty thousand, four hundred fifty-four".