20646200042 has 8 divisors (see below), whose sum is σ = 33351553956. Its totient is φ = 9529015392.

The previous prime is 20646200023. The next prime is 20646200077. The reversal of 20646200042 is 24000264602.

It can be written as a sum of positive squares in 2 ways, for example, as 20575320481 + 70879561 = 143441^2 + 8419^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 794084617 = 20646200042 / (2 + 0 + 6 + 4 + 6 + 2 + 0 + 0 + 0 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 20646199984 and 20646200020.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397042283 + ... + 397042334.

Almost surely, 2^20646200042 is an apocalyptic number.

20646200042 is a deficient number, since it is larger than the sum of its proper divisors (12705353914).

20646200042 is a wasteful number, since it uses less digits than its factorization.

20646200042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794084632.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 20646200042 its reverse (24000264602), we get a palindrome (44646464644).

The spelling of 20646200042 in words is "twenty billion, six hundred forty-six million, two hundred thousand, forty-two".