20492978 has 8 divisors (see below), whose sum is σ = 33534000. Its totient is φ = 9314980.

The previous prime is 20492971. The next prime is 20492999. The reversal of 20492978 is 87929402.

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 (20492971) 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, 465728 + ... + 465771.

It is an arithmetic number, because the mean of its divisors is an integer number (4191750).

Almost surely, 2^20492978 is an apocalyptic number.

20492978 is a deficient number, since it is larger than the sum of its proper divisors (13041022).

20492978 is a wasteful number, since it uses less digits than its factorization.

20492978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931512.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 20492978 is about 4526.9170524762. The cubic root of 20492978 is about 273.6539311085.

The spelling of 20492978 in words is "twenty million, four hundred ninety-two thousand, nine hundred seventy-eight".