20534512405 has 8 divisors (see below), whose sum is σ = 26881543584. Its totient is φ = 14934190800.

The previous prime is 20534512403. The next prime is 20534512421. The reversal of 20534512405 is 50421543502.

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

It is not a de Polignac number, because 20534512405 - 2¹ = 20534512403 is a prime.

It is a super-2 number, since 2×20534512405² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20534512403) 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, 186677331 + ... + 186677440.

It is an arithmetic number, because the mean of its divisors is an integer number (3360192948).

Almost surely, 2^20534512405 is an apocalyptic number.

It is an amenable number.

20534512405 is a deficient number, since it is larger than the sum of its proper divisors (6347031179).

20534512405 is a wasteful number, since it uses less digits than its factorization.

20534512405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373354787.

The product of its (nonzero) digits is 24000, while the sum is 31.

The spelling of 20534512405 in words is "twenty billion, five hundred thirty-four million, five hundred twelve thousand, four hundred five".