20887812 has 36 divisors (see below), whose sum is σ = 57600816. Its totient is φ = 6329520.

The previous prime is 20887807. The next prime is 20887813. The reversal of 20887812 is 21878802.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20887813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25978 + ... + 26769.

Almost surely, 2^20887812 is an apocalyptic number.

20887812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20887812 is an abundant number, since it is smaller than the sum of its proper divisors (36713004).

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

20887812 is a wasteful number, since it uses less digits than its factorization.

20887812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52768 (or 52763 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 20887812 is about 4570.3185884575. The cubic root of 20887812 is about 275.4002414391.

The spelling of 20887812 in words is "twenty million, eight hundred eighty-seven thousand, eight hundred twelve".