20894236515 has 24 divisors (see below), whose sum is σ = 37195508688. Its totient is φ = 10842413760.

The previous prime is 20894236501. The next prime is 20894236537. The reversal of 20894236515 is 51563249802.

20894236515 is a `hidden beast` number, since 20 + 8 + 94 + 23 + 6 + 515 = 666.

It is not a de Polignac number, because 20894236515 - 2¹⁵ = 20894203747 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6272881 + ... + 6276210.

It is an arithmetic number, because the mean of its divisors is an integer number (1549812862).

Almost surely, 2^20894236515 is an apocalyptic number.

20894236515 is a deficient number, since it is larger than the sum of its proper divisors (16301272173).

20894236515 is a wasteful number, since it uses less digits than its factorization.

20894236515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12549139 (or 12549136 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 20894236515 in words is "twenty billion, eight hundred ninety-four million, two hundred thirty-six thousand, five hundred fifteen".