20495611 has 4 divisors (see below), whose sum is σ = 20645352. Its totient is φ = 20345872.

The previous prime is 20495609. The next prime is 20495633. The reversal of 20495611 is 11659402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11659402 = 2 ⋅5829701.

It is a cyclic number.

It is not a de Polignac number, because 20495611 - 2¹ = 20495609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20495611.

It is not an unprimeable number, because it can be changed into a prime (20415611) 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, 74665 + ... + 74938.

It is an arithmetic number, because the mean of its divisors is an integer number (5161338).

Almost surely, 2^20495611 is an apocalyptic number.

20495611 is a deficient number, since it is larger than the sum of its proper divisors (149741).

20495611 is a wasteful number, since it uses less digits than its factorization.

20495611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149740.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20495611 is about 4527.2078591556. The cubic root of 20495611 is about 273.6656505691.

The spelling of 20495611 in words is "twenty million, four hundred ninety-five thousand, six hundred eleven".