20405530715 has 16 divisors (see below), whose sum is σ = 24800169216. Its totient is φ = 16116732000.

The previous prime is 20405530697. The next prime is 20405530771. The reversal of 20405530715 is 51703550402.

It is not a de Polignac number, because 20405530715 - 2⁸ = 20405530459 is a prime.

It is a super-2 number, since 2×20405530715² (a number of 21 digits) contains 22 as substring.

It is a Duffinian 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, 40160 + ... + 205970.

It is an arithmetic number, because the mean of its divisors is an integer number (1550010576).

Almost surely, 2^20405530715 is an apocalyptic number.

20405530715 is a deficient number, since it is larger than the sum of its proper divisors (4394638501).

20405530715 is a wasteful number, since it uses less digits than its factorization.

20405530715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166130.

The product of its (nonzero) digits is 21000, while the sum is 32.

The spelling of 20405530715 in words is "twenty billion, four hundred five million, five hundred thirty thousand, seven hundred fifteen".