20908919 has 8 divisors (see below), whose sum is σ = 21228240. Its totient is φ = 20592000.

The previous prime is 20908907. The next prime is 20908931. The reversal of 20908919 is 91980902.

It is an interprime number because it is at equal distance from previous prime (20908907) and next prime (20908931).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20908919 is a prime.

It is a super-2 number, since 2×20908919² = 874365787497122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20308919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23912 + ... + 24770.

It is an arithmetic number, because the mean of its divisors is an integer number (2653530).

Almost surely, 2^20908919 is an apocalyptic number.

20908919 is a deficient number, since it is larger than the sum of its proper divisors (319321).

20908919 is a wasteful number, since it uses less digits than its factorization.

20908919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 20908919 is about 4572.6271442137. The cubic root of 20908919 is about 275.4929736033.

The spelling of 20908919 in words is "twenty million, nine hundred eight thousand, nine hundred nineteen".