20869619 has 4 divisors (see below), whose sum is σ = 21968040. Its totient is φ = 19771200.

The previous prime is 20869613. The next prime is 20869627. The reversal of 20869619 is 91696802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20869619 is a prime.

It is a super-2 number, since 2×20869619² = 871081994410322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20869613) 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, 549182 + ... + 549219.

It is an arithmetic number, because the mean of its divisors is an integer number (5492010).

Almost surely, 2^20869619 is an apocalyptic number.

20869619 is a deficient number, since it is larger than the sum of its proper divisors (1098421).

20869619 is a wasteful number, since it uses less digits than its factorization.

20869619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098420.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 20869619 is about 4568.3278122306. The cubic root of 20869619 is about 275.3202615933.

The spelling of 20869619 in words is "twenty million, eight hundred sixty-nine thousand, six hundred nineteen".