20423772 has 48 divisors (see below), whose sum is σ = 54784800. Its totient is φ = 6572160.

The previous prime is 20423771. The next prime is 20423773. The reversal of 20423772 is 27732402.

It is an interprime number because it is at equal distance from previous prime (20423771) and next prime (20423773).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129 + ... + 6392.

It is an arithmetic number, because the mean of its divisors is an integer number (1141350).

Almost surely, 2^20423772 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20423772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27392400).

20423772 is an abundant number, since it is smaller than the sum of its proper divisors (34361028).

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

20423772 is a wasteful number, since it uses less digits than its factorization.

20423772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6563 (or 6555 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 27.

The square root of 20423772 is about 4519.2667546849. The cubic root of 20423772 is about 273.3455351814.

The spelling of 20423772 in words is "twenty million, four hundred twenty-three thousand, seven hundred seventy-two".