20947504 has 10 divisors (see below), whose sum is σ = 40585820. Its totient is φ = 10473744.

The previous prime is 20947499. The next prime is 20947517. The reversal of 20947504 is 40574902.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654594 + ... + 654625.

It is an arithmetic number, because the mean of its divisors is an integer number (4058582).

Almost surely, 2^20947504 is an apocalyptic number.

It is an amenable number.

20947504 is a deficient number, since it is larger than the sum of its proper divisors (19638316).

20947504 is a wasteful number, since it uses less digits than its factorization.

20947504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309227 (or 1309221 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20947504 is about 4576.8443277000. The cubic root of 20947504 is about 275.6623329778.

The spelling of 20947504 in words is "twenty million, nine hundred forty-seven thousand, five hundred four".