20379813 has 8 divisors (see below), whose sum is σ = 27245568. Its totient is φ = 13550304.

The previous prime is 20379809. The next prime is 20379841. The reversal of 20379813 is 31897302.

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

It is not a de Polignac number, because 20379813 - 2² = 20379809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20379713) 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, 7720 + ... + 10017.

It is an arithmetic number, because the mean of its divisors is an integer number (3405696).

Almost surely, 2^20379813 is an apocalyptic number.

It is an amenable number.

20379813 is a deficient number, since it is larger than the sum of its proper divisors (6865755).

20379813 is a wasteful number, since it uses less digits than its factorization.

20379813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18123.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20379813 is about 4514.4006246677. The cubic root of 20379813 is about 273.1492830304.

The spelling of 20379813 in words is "twenty million, three hundred seventy-nine thousand, eight hundred thirteen".