20405973 has 8 divisors (see below), whose sum is σ = 31094848. Its totient is φ = 11660544.

The previous prime is 20405969. The next prime is 20405977. The reversal of 20405973 is 37950402.

It is an interprime number because it is at equal distance from previous prime (20405969) and next prime (20405977).

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

It is not a de Polignac number, because 20405973 - 2² = 20405969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20405973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20405977) 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, 485836 + ... + 485877.

It is an arithmetic number, because the mean of its divisors is an integer number (3886856).

Almost surely, 2^20405973 is an apocalyptic number.

It is an amenable number.

20405973 is a deficient number, since it is larger than the sum of its proper divisors (10688875).

20405973 is an equidigital number, since it uses as much as digits as its factorization.

20405973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971723.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20405973 is about 4517.2970900750. The cubic root of 20405973 is about 273.2661066409.

The spelling of 20405973 in words is "twenty million, four hundred five thousand, nine hundred seventy-three".