20700819 has 16 divisors (see below), whose sum is σ = 30858240. Its totient is φ = 13714920.

The previous prime is 20700817. The next prime is 20700833. The reversal of 20700819 is 91800702.

It is not a de Polignac number, because 20700819 - 2¹ = 20700817 is a prime.

It is a super-2 number, since 2×20700819² = 857047814541522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20700792 and 20700801.

It is not an unprimeable number, because it can be changed into a prime (20700817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2214 + ... + 6804.

It is an arithmetic number, because the mean of its divisors is an integer number (1928640).

Almost surely, 2^20700819 is an apocalyptic number.

20700819 is a deficient number, since it is larger than the sum of its proper divisors (10157421).

20700819 is a wasteful number, since it uses less digits than its factorization.

20700819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4767 (or 4761 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 20700819 is about 4549.8152709753. The cubic root of 20700819 is about 274.5759591514.

The spelling of 20700819 in words is "twenty million, seven hundred thousand, eight hundred nineteen".