20406009492 has 72 divisors (see below), whose sum is σ = 58717713600. Its totient is φ = 5914782720.

The previous prime is 20406009479. The next prime is 20406009499. The reversal of 20406009492 is 29490060402.

20406009492 is a `hidden beast` number, since 2 + 0 + 4 + 0 + 600 + 9 + 49 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20406009499) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1111117 + ... + 1129332.

It is an arithmetic number, because the mean of its divisors is an integer number (815523800).

Almost surely, 2^20406009492 is an apocalyptic number.

20406009492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20406009492 is an abundant number, since it is smaller than the sum of its proper divisors (38311704108).

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

20406009492 is a wasteful number, since it uses less digits than its factorization.

20406009492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240493 (or 2240488 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

Adding to 20406009492 its reverse (29490060402), we get a palindrome (49896069894).

The spelling of 20406009492 in words is "twenty billion, four hundred six million, nine thousand, four hundred ninety-two".