20836621819 has 8 divisors (see below), whose sum is σ = 22445448480. Its totient is φ = 19228653696.

The previous prime is 20836621807. The next prime is 20836621831. The reversal of 20836621819 is 91812663802.

It is an interprime number because it is at equal distance from previous prime (20836621807) and next prime (20836621831).

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

It is a cyclic number.

It is not a de Polignac number, because 20836621819 - 2⁵ = 20836621787 is a prime.

It is a super-2 number, since 2×20836621819² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20836621859) 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, 163774 + ... + 261715.

It is an arithmetic number, because the mean of its divisors is an integer number (2805681060).

Almost surely, 2^20836621819 is an apocalyptic number.

20836621819 is a deficient number, since it is larger than the sum of its proper divisors (1608826661).

20836621819 is a wasteful number, since it uses less digits than its factorization.

20836621819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429269.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 20836621819 in words is "twenty billion, eight hundred thirty-six million, six hundred twenty-one thousand, eight hundred nineteen".