20905498 has 8 divisors (see below), whose sum is σ = 31663008. Its totient is φ = 10351164.

The previous prime is 20905429. The next prime is 20905499. The reversal of 20905498 is 89450902.

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

It is not an unprimeable number, because it can be changed into a prime (20905499) 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, 50536 + ... + 50947.

It is an arithmetic number, because the mean of its divisors is an integer number (3957876).

Almost surely, 2^20905498 is an apocalyptic number.

20905498 is a deficient number, since it is larger than the sum of its proper divisors (10757510).

20905498 is a wasteful number, since it uses less digits than its factorization.

20905498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101588.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 20905498 is about 4572.2530551141. The cubic root of 20905498 is about 275.4779479123.

The spelling of 20905498 in words is "twenty million, nine hundred five thousand, four hundred ninety-eight".