20451016 has 32 divisors (see below), whose sum is σ = 39600000. Its totient is φ = 9896256.

The previous prime is 20451007. The next prime is 20451029. The reversal of 20451016 is 61015402.

It is a junction number, because it is equal to n+sod(n) for n = 20450984 and 20451002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40735 + ... + 41233.

It is an arithmetic number, because the mean of its divisors is an integer number (1237500).

Almost surely, 2^20451016 is an apocalyptic number.

It is an amenable number.

20451016 is a deficient number, since it is larger than the sum of its proper divisors (19148984).

20451016 is a wasteful number, since it uses less digits than its factorization.

20451016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20451016 is about 4522.2799559514. The cubic root of 20451016 is about 273.4670229739.

Adding to 20451016 its reverse (61015402), we get a palindrome (81466418).

The spelling of 20451016 in words is "twenty million, four hundred fifty-one thousand, sixteen".