20723619 has 12 divisors (see below), whose sum is σ = 32142984. Its totient is φ = 11841984.

The previous prime is 20723617. The next prime is 20723627. The reversal of 20723619 is 91632702.

It is not a de Polignac number, because 20723619 - 2¹ = 20723617 is a prime.

It is a super-2 number, since 2×20723619² = 858936768914322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20723617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70342 + ... + 70635.

It is an arithmetic number, because the mean of its divisors is an integer number (2678582).

Almost surely, 2^20723619 is an apocalyptic number.

20723619 is a deficient number, since it is larger than the sum of its proper divisors (11419365).

20723619 is a wasteful number, since it uses less digits than its factorization.

20723619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140994 (or 140987 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 20723619 is about 4552.3201776676. The cubic root of 20723619 is about 274.6767286730.

The spelling of 20723619 in words is "twenty million, seven hundred twenty-three thousand, six hundred nineteen".