19902485 has 8 divisors (see below), whose sum is σ = 24528696. Its totient is φ = 15491520.

The previous prime is 19902469. The next prime is 19902499. The reversal of 19902485 is 58420991.

It can be written as a sum of positive squares in 4 ways, for example, as 6345361 + 13557124 = 2519^2 + 3682^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19902485 - 2⁴ = 19902469 is a prime.

It is a super-2 number, since 2×19902485² = 792217818350450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 53606 + ... + 53975.

It is an arithmetic number, because the mean of its divisors is an integer number (3066087).

Almost surely, 2^19902485 is an apocalyptic number.

It is an amenable number.

19902485 is a deficient number, since it is larger than the sum of its proper divisors (4626211).

19902485 is a wasteful number, since it uses less digits than its factorization.

19902485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107623.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 19902485 is about 4461.2201245848. The cubic root of 19902485 is about 270.9998819914. Note that the first 3 decimals are identical.

The spelling of 19902485 in words is "nineteen million, nine hundred two thousand, four hundred eighty-five".