20670505620621 has 32 divisors (see below), whose sum is σ = 28875447164928. Its totient is φ = 13136269417920.

The previous prime is 20670505620587. The next prime is 20670505620623. The reversal of 20670505620621 is 12602650507602.

It is not a de Polignac number, because 20670505620621 - 2¹⁷ = 20670505489549 is a prime.

It is a super-2 number, since 2×20670505620621² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20670505620623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 233724216 + ... + 233812638.

It is an arithmetic number, because the mean of its divisors is an integer number (902357723904).

Almost surely, 2^{20670505620621} is an apocalyptic number.

It is an amenable number.

20670505620621 is a deficient number, since it is larger than the sum of its proper divisors (8204941544307).

20670505620621 is a wasteful number, since it uses less digits than its factorization.

20670505620621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126041.

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 20670505620621 in words is "twenty trillion, six hundred seventy billion, five hundred five million, six hundred twenty thousand, six hundred twenty-one".