20451356 has 12 divisors (see below), whose sum is σ = 35824992. Its totient is φ = 10215648.

The previous prime is 20451329. The next prime is 20451373. The reversal of 20451356 is 65315402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3896 + ... + 7488.

It is an arithmetic number, because the mean of its divisors is an integer number (2985416).

Almost surely, 2^20451356 is an apocalyptic number.

It is an amenable number.

20451356 is a deficient number, since it is larger than the sum of its proper divisors (15373636).

20451356 is a wasteful number, since it uses less digits than its factorization.

20451356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5020 (or 5018 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20451356 is about 4522.3175474529. The cubic root of 20451356 is about 273.4685384369.

Adding to 20451356 its reverse (65315402), we get a palindrome (85766758).

The spelling of 20451356 in words is "twenty million, four hundred fifty-one thousand, three hundred fifty-six".