20409264171672 has 64 divisors (see below), whose sum is σ = 52236212878080. Its totient is φ = 6641508139392.

The previous prime is 20409264171587. The next prime is 20409264171689. The reversal of 20409264171672 is 27617146290402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2975628 + ... + 7047899.

It is an arithmetic number, because the mean of its divisors is an integer number (816190826220).

Almost surely, 2^{20409264171672} is an apocalyptic number.

It is an amenable number.

20409264171672 is an abundant number, since it is smaller than the sum of its proper divisors (31826948706408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20409264171672 is a wasteful number, since it uses less digits than its factorization.

20409264171672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10025552 (or 10025548 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 51.

The spelling of 20409264171672 in words is "twenty trillion, four hundred nine billion, two hundred sixty-four million, one hundred seventy-one thousand, six hundred seventy-two".