20940816 has 80 divisors (see below), whose sum is σ = 59898944. Its totient is φ = 6262272.

The previous prime is 20940809. The next prime is 20940823. The reversal of 20940816 is 61804902.

It is an interprime number because it is at equal distance from previous prime (20940809) and next prime (20940823).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22635 + ... + 23541.

Almost surely, 2^20940816 is an apocalyptic number.

20940816 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20940816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29949472).

20940816 is an abundant number, since it is smaller than the sum of its proper divisors (38958128).

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

20940816 is a wasteful number, since it uses less digits than its factorization.

20940816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968 (or 962 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20940816 is about 4576.1136349527. The cubic root of 20940816 is about 275.6329925542.

The spelling of 20940816 in words is "twenty million, nine hundred forty thousand, eight hundred sixteen".