20767393 has 4 divisors (see below), whose sum is σ = 21483540. Its totient is φ = 20051248.

The previous prime is 20767339. The next prime is 20767423. The reversal of 20767393 is 39376702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16136289 + 4631104 = 4017^2 + 2152^2 .

It is a cyclic number.

It is not a de Polignac number, because 20767393 - 2¹³ = 20759201 is a prime.

It is a super-2 number, since 2×20767393² = 862569224032898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20767333) 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, 358030 + ... + 358087.

It is an arithmetic number, because the mean of its divisors is an integer number (5370885).

Almost surely, 2^20767393 is an apocalyptic number.

It is an amenable number.

20767393 is a deficient number, since it is larger than the sum of its proper divisors (716147).

20767393 is an equidigital number, since it uses as much as digits as its factorization.

20767393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716146.

The product of its (nonzero) digits is 47628, while the sum is 37.

The square root of 20767393 is about 4557.1255194475. The cubic root of 20767393 is about 274.8699903366.

It can be divided in two parts, 207 and 67393, that added together give a square (67600 = 260²).

The spelling of 20767393 in words is "twenty million, seven hundred sixty-seven thousand, three hundred ninety-three".