20745315 has 40 divisors (see below), whose sum is σ = 37525488. Its totient is φ = 10964160.

The previous prime is 20745301. The next prime is 20745341. The reversal of 20745315 is 51354702.

It is a happy number.

20745315 is a `hidden beast` number, since 207 + 453 + 1 + 5 = 666.

It is not a de Polignac number, because 20745315 - 2⁶ = 20745251 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 73164 + ... + 73446.

Almost surely, 2^20745315 is an apocalyptic number.

20745315 is a deficient number, since it is larger than the sum of its proper divisors (16780173).

20745315 is a wasteful number, since it uses less digits than its factorization.

20745315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 20745315 is about 4554.7025149838. The cubic root of 20745315 is about 274.7725502224.

The spelling of 20745315 in words is "twenty million, seven hundred forty-five thousand, three hundred fifteen".