20451416 has 16 divisors (see below), whose sum is σ = 40014000. Its totient is φ = 9781024.

The previous prime is 20451407. The next prime is 20451437. The reversal of 20451416 is 61415402.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 20451391 and 20451400.

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, 55391 + ... + 55758.

It is an arithmetic number, because the mean of its divisors is an integer number (2500875).

Almost surely, 2^20451416 is an apocalyptic number.

It is an amenable number.

20451416 is a deficient number, since it is larger than the sum of its proper divisors (19562584).

20451416 is a wasteful number, since it uses less digits than its factorization.

20451416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111178 (or 111174 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20451416 is about 4522.3241812148. The cubic root of 20451416 is about 273.4688058698.

Adding to 20451416 its reverse (61415402), we get a palindrome (81866818).

The spelling of 20451416 in words is "twenty million, four hundred fifty-one thousand, four hundred sixteen".