20921498 has 16 divisors (see below), whose sum is σ = 34100136. Its totient is φ = 9569280.

The previous prime is 20921479. The next prime is 20921501. The reversal of 20921498 is 89412902.

It can be written as a sum of positive squares in 4 ways, for example, as 2319529 + 18601969 = 1523^2 + 4313^2 .

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, 623 + ... + 6498.

Almost surely, 2^20921498 is an apocalyptic number.

20921498 is a deficient number, since it is larger than the sum of its proper divisors (13178638).

20921498 is a wasteful number, since it uses less digits than its factorization.

20921498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7249.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 20921498 is about 4574.0024048966. The cubic root of 20921498 is about 275.5482089059.

The spelling of 20921498 in words is "twenty million, nine hundred twenty-one thousand, four hundred ninety-eight".