20923011 has 6 divisors (see below), whose sum is σ = 30222140. Its totient is φ = 13948668.

The previous prime is 20923003. The next prime is 20923033. The reversal of 20923011 is 11032902.

It is a happy number.

It is not a de Polignac number, because 20923011 - 2³ = 20923003 is a prime.

It is a super-2 number, since 2×20923011² = 875544778612242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20923411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1162381 + ... + 1162398.

Almost surely, 2^20923011 is an apocalyptic number.

20923011 is a deficient number, since it is larger than the sum of its proper divisors (9299129).

20923011 is a wasteful number, since it uses less digits than its factorization.

20923011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2324785 (or 2324782 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 20923011 is about 4574.1677931619. The cubic root of 20923011 is about 275.5548511069.

Adding to 20923011 its reverse (11032902), we get a palindrome (31955913).

It can be divided in two parts, 209 and 23011, that added together give a triangular number (23220 = T₂₁₅).

The spelling of 20923011 in words is "twenty million, nine hundred twenty-three thousand, eleven".