20929811 has 12 divisors (see below), whose sum is σ = 25629480. Its totient is φ = 16994880.

The previous prime is 20929807. The next prime is 20929813. The reversal of 20929811 is 11892902.

It is a happy number.

It is not a de Polignac number, because 20929811 - 2² = 20929807 is a prime.

It is a super-3 number, since 3×20929811³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20929813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10310 + ... + 12171.

It is an arithmetic number, because the mean of its divisors is an integer number (2135790).

Almost surely, 2^20929811 is an apocalyptic number.

20929811 is a deficient number, since it is larger than the sum of its proper divisors (4699669).

20929811 is a wasteful number, since it uses less digits than its factorization.

20929811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22514 (or 22507 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 20929811 is about 4574.9110373864. The cubic root of 20929811 is about 275.5846997432.

The spelling of 20929811 in words is "twenty million, nine hundred twenty-nine thousand, eight hundred eleven".