20821468 has 6 divisors (see below), whose sum is σ = 36437576. Its totient is φ = 10410732.

The previous prime is 20821439. The next prime is 20821469. The reversal of 20821468 is 86412802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20821469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2602680 + ... + 2602687.

Almost surely, 2^20821468 is an apocalyptic number.

It is an amenable number.

20821468 is a deficient number, since it is larger than the sum of its proper divisors (15616108).

20821468 is a wasteful number, since it uses less digits than its factorization.

20821468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5205371 (or 5205369 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 20821468 is about 4563.0546786117. The cubic root of 20821468 is about 275.1083561977.

The spelling of 20821468 in words is "twenty million, eight hundred twenty-one thousand, four hundred sixty-eight".