20403492 has 48 divisors (see below), whose sum is σ = 50635200. Its totient is φ = 6376320.

The previous prime is 20403491. The next prime is 20403521. The reversal of 20403492 is 29430402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20403491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24442 + ... + 25262.

It is an arithmetic number, because the mean of its divisors is an integer number (1054900).

Almost surely, 2^20403492 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 20403492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25317600).

20403492 is an abundant number, since it is smaller than the sum of its proper divisors (30231708).

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

20403492 is a wasteful number, since it uses less digits than its factorization.

20403492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20403492 is about 4517.0224706105. The cubic root of 20403492 is about 273.2550314410.

Adding to 20403492 its reverse (29430402), we get a palindrome (49833894).

The spelling of 20403492 in words is "twenty million, four hundred three thousand, four hundred ninety-two".