20476644 has 12 divisors (see below), whose sum is σ = 47778864. Its totient is φ = 6825544.

The previous prime is 20476637. The next prime is 20476649. The reversal of 20476644 is 44667402.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (20476649) 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, 853182 + ... + 853205.

It is an arithmetic number, because the mean of its divisors is an integer number (3981572).

Almost surely, 2^20476644 is an apocalyptic number.

It is an amenable number.

20476644 is an abundant number, since it is smaller than the sum of its proper divisors (27302220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20476644 is a wasteful number, since it uses less digits than its factorization.

20476644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706394 (or 1706392 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 33.

The square root of 20476644 is about 4525.1125952842. The cubic root of 20476644 is about 273.5812061746.

The spelling of 20476644 in words is "twenty million, four hundred seventy-six thousand, six hundred forty-four".