20651495 has 16 divisors (see below), whose sum is σ = 25613280. Its totient is φ = 15974400.

The previous prime is 20651473. The next prime is 20651497. The reversal of 20651495 is 59415602.

It is a happy number.

It is not a de Polignac number, because 20651495 - 2²⁴ = 3874279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26471 + ... + 27239.

It is an arithmetic number, because the mean of its divisors is an integer number (1600830).

Almost surely, 2^20651495 is an apocalyptic number.

20651495 is a deficient number, since it is larger than the sum of its proper divisors (4961785).

20651495 is a wasteful number, since it uses less digits than its factorization.

20651495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 20651495 is about 4544.3915984431. The cubic root of 20651495 is about 274.3577076359.

The spelling of 20651495 in words is "twenty million, six hundred fifty-one thousand, four hundred ninety-five".