20556426332642 has 32 divisors (see below), whose sum is σ = 31681347255360. Its totient is φ = 9999991834560.

The previous prime is 20556426332593. The next prime is 20556426332647. The reversal of 20556426332642 is 24623362465502.

It is not an unprimeable number, because it can be changed into a prime (20556426332647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3983228 + ... + 7548440.

It is an arithmetic number, because the mean of its divisors is an integer number (990042101730).

Almost surely, 2^{20556426332642} is an apocalyptic number.

20556426332642 is a deficient number, since it is larger than the sum of its proper divisors (11124920922718).

20556426332642 is a wasteful number, since it uses less digits than its factorization.

20556426332642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3565778.

The product of its (nonzero) digits is 12441600, while the sum is 50.

The spelling of 20556426332642 in words is "twenty trillion, five hundred fifty-six billion, four hundred twenty-six million, three hundred thirty-two thousand, six hundred forty-two".