20355266644642 has 16 divisors (see below), whose sum is σ = 31285032970464. Its totient is φ = 9927040228000.

The previous prime is 20355266644481. The next prime is 20355266644649. The reversal of 20355266644642 is 24644666255302.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20355266644649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29129284 + ... + 29819887.

It is an arithmetic number, because the mean of its divisors is an integer number (1955314560654).

Almost surely, 2^{20355266644642} is an apocalyptic number.

20355266644642 is a deficient number, since it is larger than the sum of its proper divisors (10929766325822).

20355266644642 is a wasteful number, since it uses less digits than its factorization.

20355266644642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58953425.

The product of its (nonzero) digits is 49766400, while the sum is 55.

The spelling of 20355266644642 in words is "twenty trillion, three hundred fifty-five billion, two hundred sixty-six million, six hundred forty-four thousand, six hundred forty-two".