20705475 has 24 divisors (see below), whose sum is σ = 39124480. Its totient is φ = 9465120.

The previous prime is 20705471. The next prime is 20705491. The reversal of 20705475 is 57450702.

It is not a de Polignac number, because 20705475 - 2² = 20705471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20705471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19195 + ... + 20244.

Almost surely, 2^20705475 is an apocalyptic number.

20705475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20705475 is a deficient number, since it is larger than the sum of its proper divisors (18419005).

20705475 is a wasteful number, since it uses less digits than its factorization.

20705475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39459 (or 39454 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 30.

The square root of 20705475 is about 4550.3269113329. The cubic root of 20705475 is about 274.5965433584.

The spelling of 20705475 in words is "twenty million, seven hundred five thousand, four hundred seventy-five".