20837973 has 8 divisors (see below), whose sum is σ = 29921248. Its totient is φ = 12823344.

The previous prime is 20837899. The next prime is 20837981. The reversal of 20837973 is 37973802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20837973 - 2¹² = 20833877 is a prime.

It is a super-2 number, since 2×20837973² = 868442237497458, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 534307 = 20837973 / (2 + 0 + 8 + 3 + 7 + 9 + 7 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20837273) 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, 267115 + ... + 267192.

It is an arithmetic number, because the mean of its divisors is an integer number (3740156).

Almost surely, 2^20837973 is an apocalyptic number.

It is an amenable number.

20837973 is a deficient number, since it is larger than the sum of its proper divisors (9083275).

20837973 is a wasteful number, since it uses less digits than its factorization.

20837973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534323.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 20837973 is about 4564.8628676007. The cubic root of 20837973 is about 275.1810290141.

The spelling of 20837973 in words is "twenty million, eight hundred thirty-seven thousand, nine hundred seventy-three".