20503978 has 8 divisors (see below), whose sum is σ = 33552000. Its totient is φ = 9319980.

The previous prime is 20503969. The next prime is 20503981. The reversal of 20503978 is 87930502.

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

It is a super-2 number, since 2×20503978² = 840826227648968, which contains 22 as substring.

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, 465978 + ... + 466021.

It is an arithmetic number, because the mean of its divisors is an integer number (4194000).

Almost surely, 2^20503978 is an apocalyptic number.

20503978 is a deficient number, since it is larger than the sum of its proper divisors (13048022).

20503978 is a wasteful number, since it uses less digits than its factorization.

20503978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932012.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20503978 is about 4528.1318443703. The cubic root of 20503978 is about 273.7028853537.

The spelling of 20503978 in words is "twenty million, five hundred three thousand, nine hundred seventy-eight".