20407421686685 has 128 divisors (see below), whose sum is σ = 30006402877440. Its totient is φ = 13131262771200.

The previous prime is 20407421686679. The next prime is 20407421686699. The reversal of 20407421686685 is 58668612470402.

It is not a de Polignac number, because 20407421686685 - 2¹⁴ = 20407421670301 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1211617874 + ... + 1211634716.

It is an arithmetic number, because the mean of its divisors is an integer number (234425022480).

Almost surely, 2^{20407421686685} is an apocalyptic number.

It is an amenable number.

20407421686685 is a deficient number, since it is larger than the sum of its proper divisors (9598981190755).

20407421686685 is a wasteful number, since it uses less digits than its factorization.

20407421686685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17419.

The product of its (nonzero) digits is 30965760, while the sum is 59.

The spelling of 20407421686685 in words is "twenty trillion, four hundred seven billion, four hundred twenty-one million, six hundred eighty-six thousand, six hundred eighty-five".