20490072 has 64 divisors (see below), whose sum is σ = 52876800. Its totient is φ = 6614400.

The previous prime is 20490047. The next prime is 20490077. The reversal of 20490072 is 27009402.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20490077) 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, 191443 + ... + 191549.

It is an arithmetic number, because the mean of its divisors is an integer number (826200).

Almost surely, 2^20490072 is an apocalyptic number.

It is an amenable number.

20490072 is an abundant number, since it is smaller than the sum of its proper divisors (32386728).

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

20490072 is a wasteful number, since it uses less digits than its factorization.

20490072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20490072 is about 4526.5960721054. The cubic root of 20490072 is about 273.6409953618.

Adding to 20490072 its reverse (27009402), we get a palindrome (47499474).

The spelling of 20490072 in words is "twenty million, four hundred ninety thousand, seventy-two".