20278672 has 20 divisors (see below), whose sum is σ = 39461760. Its totient is φ = 10095008.

The previous prime is 20278651. The next prime is 20278673. The reversal of 20278672 is 27687202.

It is a super-2 number, since 2×20278672² = 822449076167168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20278673) 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, 1173 + ... + 6475.

It is an arithmetic number, because the mean of its divisors is an integer number (1973088).

Almost surely, 2^20278672 is an apocalyptic number.

It is an amenable number.

20278672 is a deficient number, since it is larger than the sum of its proper divisors (19183088).

20278672 is a wasteful number, since it uses less digits than its factorization.

20278672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5550 (or 5544 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 20278672 is about 4503.1846508887. The cubic root of 20278672 is about 272.6966714217.

The spelling of 20278672 in words is "twenty million, two hundred seventy-eight thousand, six hundred seventy-two".