20475951 has 8 divisors (see below), whose sum is σ = 27498240. Its totient is φ = 13552152.

The previous prime is 20475941. The next prime is 20475953. The reversal of 20475951 is 15957402.

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

It is not a de Polignac number, because 20475951 - 2⁵ = 20475919 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20475953) 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, 24135 + ... + 24968.

It is an arithmetic number, because the mean of its divisors is an integer number (3437280).

Almost surely, 2^20475951 is an apocalyptic number.

20475951 is a deficient number, since it is larger than the sum of its proper divisors (7022289).

20475951 is a wasteful number, since it uses less digits than its factorization.

20475951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49245.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 20475951 is about 4525.0360219561. The cubic root of 20475951 is about 273.5781198304.

The spelling of 20475951 in words is "twenty million, four hundred seventy-five thousand, nine hundred fifty-one".