20263951 has 4 divisors (see below), whose sum is σ = 20443392. Its totient is φ = 20084512.

The previous prime is 20263939. The next prime is 20263961. The reversal of 20263951 is 15936202.

20263951 = T₃₆₇₄ + T₃₆₇₅ + T₃₆₇₆.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15936202 = 2 ⋅7968101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20263951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20263921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89551 + ... + 89776.

It is an arithmetic number, because the mean of its divisors is an integer number (5110848).

Almost surely, 2^20263951 is an apocalyptic number.

20263951 is the 3676-th centered triangular number.

20263951 is a deficient number, since it is larger than the sum of its proper divisors (179441).

20263951 is a wasteful number, since it uses less digits than its factorization.

20263951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179440.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 20263951 is about 4501.5498442203. The cubic root of 20263951 is about 272.6306687518.

The spelling of 20263951 in words is "twenty million, two hundred sixty-three thousand, nine hundred fifty-one".