20752406 has 4 divisors (see below), whose sum is σ = 31128612. Its totient is φ = 10376202.

The previous prime is 20752399. The next prime is 20752409. The reversal of 20752406 is 60425702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60425702 = 2 ⋅30212851.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20752409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5188100 + ... + 5188103.

It is an arithmetic number, because the mean of its divisors is an integer number (7782153).

Almost surely, 2^20752406 is an apocalyptic number.

20752406 is a deficient number, since it is larger than the sum of its proper divisors (10376206).

20752406 is a wasteful number, since it uses less digits than its factorization.

20752406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10376205.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20752406 is about 4555.4808747266. The cubic root of 20752406 is about 274.8038535183.

The spelling of 20752406 in words is "twenty million, seven hundred fifty-two thousand, four hundred six".