20693649 has 4 divisors (see below), whose sum is σ = 27591536. Its totient is φ = 13795764.

The previous prime is 20693639. The next prime is 20693663. The reversal of 20693649 is 94639602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20693649 - 2¹⁵ = 20660881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20693609) 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, 3448939 + ... + 3448944.

It is an arithmetic number, because the mean of its divisors is an integer number (6897884).

Almost surely, 2^20693649 is an apocalyptic number.

It is an amenable number.

20693649 is a deficient number, since it is larger than the sum of its proper divisors (6897887).

20693649 is an equidigital number, since it uses as much as digits as its factorization.

20693649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6897886.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 20693649 is about 4549.0272586565. The cubic root of 20693649 is about 274.5442544965.

The spelling of 20693649 in words is "twenty million, six hundred ninety-three thousand, six hundred forty-nine".