20472145401478 has 4 divisors (see below), whose sum is σ = 30708218102220. Its totient is φ = 10236072700738.

The previous prime is 20472145401473. The next prime is 20472145401571. The reversal of 20472145401478 is 87410454127402.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) 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 (20472145401473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5118036350368 + ... + 5118036350371.

It is an arithmetic number, because the mean of its divisors is an integer number (7677054525555).

Almost surely, 2^{20472145401478} is an apocalyptic number.

20472145401478 is a deficient number, since it is larger than the sum of its proper divisors (10236072700742).

20472145401478 is a wasteful number, since it uses less digits than its factorization.

20472145401478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10236072700741.

The product of its (nonzero) digits is 2007040, while the sum is 49.

The spelling of 20472145401478 in words is "twenty trillion, four hundred seventy-two billion, one hundred forty-five million, four hundred one thousand, four hundred seventy-eight".