20406535473 has 8 divisors (see below), whose sum is σ = 28146945600. Its totient is φ = 13135241168.

The previous prime is 20406535453. The next prime is 20406535483. The reversal of 20406535473 is 37453560402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20406535473 - 2¹² = 20406531377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20406535423) 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, 117278853 + ... + 117279026.

It is an arithmetic number, because the mean of its divisors is an integer number (3518368200).

Almost surely, 2^20406535473 is an apocalyptic number.

It is an amenable number.

20406535473 is a deficient number, since it is larger than the sum of its proper divisors (7740410127).

20406535473 is a wasteful number, since it uses less digits than its factorization.

20406535473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234557911.

The product of its (nonzero) digits is 302400, while the sum is 39.

The spelling of 20406535473 in words is "twenty billion, four hundred six million, five hundred thirty-five thousand, four hundred seventy-three".