20206764 has 36 divisors (see below), whose sum is σ = 51247560. Its totient is φ = 6713280.

The previous prime is 20206763. The next prime is 20206783. The reversal of 20206764 is 46760202.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20206764² = 816626622703392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20206763) 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 in 11 ways as a sum of consecutive naturals, for example, 12904 + ... + 14384.

Almost surely, 2^20206764 is an apocalyptic number.

It is an amenable number.

20206764 is an abundant number, since it is smaller than the sum of its proper divisors (31040796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20206764 is a wasteful number, since it uses less digits than its factorization.

20206764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1870 (or 1865 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20206764 is about 4495.1934329904. The cubic root of 20206764 is about 272.3739629806.

Adding to 20206764 its reverse (46760202), we get a palindrome (66966966).

The spelling of 20206764 in words is "twenty million, two hundred six thousand, seven hundred sixty-four".