20981862 has 32 divisors (see below), whose sum is σ = 50866560. Its totient is φ = 6357960.

The previous prime is 20981861. The next prime is 20981867. The reversal of 20981862 is 26818902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20981861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17068 + ... + 18255.

It is an arithmetic number, because the mean of its divisors is an integer number (1589580).

Almost surely, 2^20981862 is an apocalyptic number.

20981862 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20981862 is an abundant number, since it is smaller than the sum of its proper divisors (29884698).

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

20981862 is a wasteful number, since it uses less digits than its factorization.

20981862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35345 (or 35339 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 20981862 is about 4580.5962493981. The cubic root of 20981862 is about 275.8129640178.

The spelling of 20981862 in words is "twenty million, nine hundred eighty-one thousand, eight hundred sixty-two".