20723801 has 4 divisors (see below), whose sum is σ = 23684352. Its totient is φ = 17763252.

The previous prime is 20723783. The next prime is 20723803. The reversal of 20723801 is 10832702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20723801 - 2²² = 16529497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20723803) 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, 1480265 + ... + 1480278.

It is an arithmetic number, because the mean of its divisors is an integer number (5921088).

Almost surely, 2^20723801 is an apocalyptic number.

It is an amenable number.

20723801 is a deficient number, since it is larger than the sum of its proper divisors (2960551).

20723801 is an equidigital number, since it uses as much as digits as its factorization.

20723801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2960550.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20723801 is about 4552.3401674304. The cubic root of 20723801 is about 274.6775327639.

The spelling of 20723801 in words is "twenty million, seven hundred twenty-three thousand, eight hundred one".