20978503 has 16 divisors (see below), whose sum is σ = 25945920. Its totient is φ = 16517376.

The previous prime is 20978483. The next prime is 20978533. The reversal of 20978503 is 30587902.

It is a cyclic number.

It is not a de Polignac number, because 20978503 - 2²¹ = 18881351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20978533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24051 + ... + 24907.

It is an arithmetic number, because the mean of its divisors is an integer number (1621620).

Almost surely, 2^20978503 is an apocalyptic number.

20978503 is a deficient number, since it is larger than the sum of its proper divisors (4967417).

20978503 is a wasteful number, since it uses less digits than its factorization.

20978503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20978503 is about 4580.2295793988. The cubic root of 20978503 is about 275.7982448731.

The spelling of 20978503 in words is "twenty million, nine hundred seventy-eight thousand, five hundred three".