20451036 has 24 divisors (see below), whose sum is σ = 47797120. Its totient is φ = 6805872.

The previous prime is 20451029. The next prime is 20451037. The reversal of 20451036 is 63015402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9945 + ... + 11823.

Almost surely, 2^20451036 is an apocalyptic number.

It is an amenable number.

20451036 is an abundant number, since it is smaller than the sum of its proper divisors (27346084).

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

20451036 is a wasteful number, since it uses less digits than its factorization.

20451036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2793 (or 2791 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20451036 is about 4522.2821672249. The cubic root of 20451036 is about 273.4671121193.

Adding to 20451036 its reverse (63015402), we get a palindrome (83466438).

It can be divided in two parts, 2045 and 1036, that added together give a triangular number (3081 = T₇₈).

The spelling of 20451036 in words is "twenty million, four hundred fifty-one thousand, thirty-six".