20406766 has 16 divisors (see below), whose sum is σ = 33203520. Its totient is φ = 9368320.

The previous prime is 20406697. The next prime is 20406767. The reversal of 20406766 is 66760402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20406767) 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, 5926 + ... + 8713.

It is an arithmetic number, because the mean of its divisors is an integer number (2075220).

Almost surely, 2^20406766 is an apocalyptic number.

20406766 is a deficient number, since it is larger than the sum of its proper divisors (12796754).

20406766 is a wasteful number, since it uses less digits than its factorization.

20406766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14699.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 20406766 is about 4517.3848629489. The cubic root of 20406766 is about 273.2696464087.

The spelling of 20406766 in words is "twenty million, four hundred six thousand, seven hundred sixty-six".