20406492 has 30 divisors (see below), whose sum is σ = 53347448. Its totient is φ = 6802056.

The previous prime is 20406461. The next prime is 20406521. The reversal of 20406492 is 29460402.

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

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 31168 + ... + 31815.

Almost surely, 2^20406492 is an apocalyptic number.

It is an amenable number.

20406492 is an abundant number, since it is smaller than the sum of its proper divisors (32940956).

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

20406492 is a wasteful number, since it uses less digits than its factorization.

20406492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62999 (or 62988 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20406492 is about 4517.3545355661. The cubic root of 20406492 is about 273.2684233467.

Adding to 20406492 its reverse (29460402), we get a palindrome (49866894).

The spelling of 20406492 in words is "twenty million, four hundred six thousand, four hundred ninety-two".