20987814 has 16 divisors (see below), whose sum is σ = 42050880. Its totient is φ = 6983400.

The previous prime is 20987807. The next prime is 20987821. The reversal of 20987814 is 41878902.

It is an interprime number because it is at equal distance from previous prime (20987807) and next prime (20987821).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 889 + ... + 6539.

It is an arithmetic number, because the mean of its divisors is an integer number (2628180).

Almost surely, 2^20987814 is an apocalyptic number.

20987814 is an abundant number, since it is smaller than the sum of its proper divisors (21063066).

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

20987814 is a wasteful number, since it uses less digits than its factorization.

20987814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6275.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 20987814 is about 4581.2459004074. The cubic root of 20987814 is about 275.8390418362.

The spelling of 20987814 in words is "twenty million, nine hundred eighty-seven thousand, eight hundred fourteen".