20738202770621 has 16 divisors (see below), whose sum is σ = 24731445657600. Its totient is φ = 17002631305968.

The previous prime is 20738202770617. The next prime is 20738202770647. The reversal of 20738202770621 is 12607720283702.

It is not a de Polignac number, because 20738202770621 - 2² = 20738202770617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20738202770651) 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, 28387310 + ... + 29108688.

It is an arithmetic number, because the mean of its divisors is an integer number (1545715353600).

Almost surely, 2^{20738202770621} is an apocalyptic number.

It is an amenable number.

20738202770621 is a deficient number, since it is larger than the sum of its proper divisors (3993242886979).

20738202770621 is a wasteful number, since it uses less digits than its factorization.

20738202770621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899968.

The product of its (nonzero) digits is 790272, while the sum is 47.

The spelling of 20738202770621 in words is "twenty trillion, seven hundred thirty-eight billion, two hundred two million, seven hundred seventy thousand, six hundred twenty-one".