20438811 has 20 divisors (see below), whose sum is σ = 32330232. Its totient is φ = 12823488.

The previous prime is 20438809. The next prime is 20438849. The reversal of 20438811 is 11883402.

It is not a de Polignac number, because 20438811 - 2¹ = 20438809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20438311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6045 + ... + 8798.

Almost surely, 2^20438811 is an apocalyptic number.

20438811 is a deficient number, since it is larger than the sum of its proper divisors (11891421).

20438811 is a wasteful number, since it uses less digits than its factorization.

20438811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14872 (or 14863 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20438811 is about 4520.9303246124. The cubic root of 20438811 is about 273.4126111833.

The spelling of 20438811 in words is "twenty million, four hundred thirty-eight thousand, eight hundred eleven".