20716019 has 4 divisors (see below), whose sum is σ = 20764296. Its totient is φ = 20667744.

The previous prime is 20716001. The next prime is 20716037. The reversal of 20716019 is 91061702.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20716001) and next prime (20716037).

It is a cyclic number.

It is not a de Polignac number, because 20716019 - 2⁸ = 20715763 is a prime.

It is a super-2 number, since 2×20716019² = 858306886416722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20716079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23489 + ... + 24354.

It is an arithmetic number, because the mean of its divisors is an integer number (5191074).

Almost surely, 2^20716019 is an apocalyptic number.

20716019 is a deficient number, since it is larger than the sum of its proper divisors (48277).

20716019 is an equidigital number, since it uses as much as digits as its factorization.

20716019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48276.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 20716019 is about 4551.4853619450. The cubic root of 20716019 is about 274.6431470485.

The spelling of 20716019 in words is "twenty million, seven hundred sixteen thousand, nineteen".