20821496 has 16 divisors (see below), whose sum is σ = 39681240. Its totient is φ = 10239840.

The previous prime is 20821487. The next prime is 20821499. The reversal of 20821496 is 69412802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20821499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20846 + ... + 21821.

Almost surely, 2^20821496 is an apocalyptic number.

It is an amenable number.

20821496 is a deficient number, since it is larger than the sum of its proper divisors (18859744).

20821496 is a wasteful number, since it uses less digits than its factorization.

20821496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42734 (or 42730 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 20821496 is about 4563.0577467308. The cubic root of 20821496 is about 275.1084795164.

The spelling of 20821496 in words is "twenty million, eight hundred twenty-one thousand, four hundred ninety-six".