20477936 has 10 divisors (see below), whose sum is σ = 39676032. Its totient is φ = 10238960.

The previous prime is 20477929. The next prime is 20477957. The reversal of 20477936 is 63977402.

It is a self number, because there is not a number n which added to its sum of digits gives 20477936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639920 + ... + 639951.

Almost surely, 2^20477936 is an apocalyptic number.

It is an amenable number.

20477936 is a deficient number, since it is larger than the sum of its proper divisors (19198096).

20477936 is a wasteful number, since it uses less digits than its factorization.

20477936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279879 (or 1279873 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 20477936 is about 4525.2553519111. The cubic root of 20477936 is about 273.5869600388.

The spelling of 20477936 in words is "twenty million, four hundred seventy-seven thousand, nine hundred thirty-six".