20730919 has 8 divisors (see below), whose sum is σ = 23806080. Its totient is φ = 17854200.

The previous prime is 20730917. The next prime is 20730923. The reversal of 20730919 is 91903702.

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 20730919 - 2¹ = 20730917 is a prime.

It is a super-2 number, since 2×20730919² = 859542005169122, 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 (20730917) 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, 49387 + ... + 49804.

It is an arithmetic number, because the mean of its divisors is an integer number (2975760).

Almost surely, 2^20730919 is an apocalyptic number.

20730919 is a deficient number, since it is larger than the sum of its proper divisors (3075161).

20730919 is a wasteful number, since it uses less digits than its factorization.

20730919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99221.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 20730919 is about 4553.1218960182. The cubic root of 20730919 is about 274.7089769775.

The spelling of 20730919 in words is "twenty million, seven hundred thirty thousand, nine hundred nineteen".