20778274478142 has 48 divisors (see below), whose sum is σ = 45073068255072. Its totient is φ = 6917869255680.

The previous prime is 20778274478099. The next prime is 20778274478149. The reversal of 20778274478142 is 24187447287702.

20778274478142 is a `hidden beast` number, since 2 + 0 + 7 + 7 + 82 + 74 + 478 + 14 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20778274478142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20778274478149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56243167 + ... + 56611397.

It is an arithmetic number, because the mean of its divisors is an integer number (939022255314).

Almost surely, 2^{20778274478142} is an apocalyptic number.

20778274478142 is an abundant number, since it is smaller than the sum of its proper divisors (24294793776930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20778274478142 is a wasteful number, since it uses less digits than its factorization.

20778274478142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371953 (or 371950 counting only the distinct ones).

The product of its (nonzero) digits is 78675968, while the sum is 63.

The spelling of 20778274478142 in words is "twenty trillion, seven hundred seventy-eight billion, two hundred seventy-four million, four hundred seventy-eight thousand, one hundred forty-two".