20723370 has 32 divisors (see below), whose sum is σ = 49939200. Its totient is φ = 5503680.

The previous prime is 20723317. The next prime is 20723393. The reversal of 20723370 is 7332702.

It is a self number, because there is not a number n which added to its sum of digits gives 20723370.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6856 + ... + 9404.

It is an arithmetic number, because the mean of its divisors is an integer number (1560600).

Almost surely, 2^20723370 is an apocalyptic number.

20723370 is an abundant number, since it is smaller than the sum of its proper divisors (29215830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20723370 is a wasteful number, since it uses less digits than its factorization.

20723370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2830.

The product of its (nonzero) digits is 1764, while the sum is 24.

The square root of 20723370 is about 4552.2928288940. The cubic root of 20723370 is about 274.6756285631.

The spelling of 20723370 in words is "twenty million, seven hundred twenty-three thousand, three hundred seventy".