20642998 has 8 divisors (see below), whose sum is σ = 32785992. Its totient is φ = 9714336.

The previous prime is 20642971. The next prime is 20643043. The reversal of 20642998 is 89924602.

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

It is a super-2 number, since 2×20642998² = 852266732856008, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20642998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303540 + ... + 303607.

It is an arithmetic number, because the mean of its divisors is an integer number (4098249).

Almost surely, 2^20642998 is an apocalyptic number.

20642998 is a deficient number, since it is larger than the sum of its proper divisors (12142994).

20642998 is a wasteful number, since it uses less digits than its factorization.

20642998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607166.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 20642998 is about 4543.4566136368. The cubic root of 20642998 is about 274.3200745697.

It can be divided in two parts, 206 and 42998, that multiplied together give a palindrome (8857588).

The spelling of 20642998 in words is "twenty million, six hundred forty-two thousand, nine hundred ninety-eight".