20820942 has 16 divisors (see below), whose sum is σ = 46268880. Its totient is φ = 6940296.

The previous prime is 20820929. The next prime is 20820959. The reversal of 20820942 is 24902802.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 192733 + ... + 192840.

It is an arithmetic number, because the mean of its divisors is an integer number (2891805).

Almost surely, 2^20820942 is an apocalyptic number.

20820942 is an abundant number, since it is smaller than the sum of its proper divisors (25447938).

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

20820942 is a wasteful number, since it uses less digits than its factorization.

20820942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385584 (or 385578 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20820942 is about 4562.9970414192. The cubic root of 20820942 is about 275.1060395468.

Adding to 20820942 its sum of digits (27), we get a square (20820969 = 4563²).

The spelling of 20820942 in words is "twenty million, eight hundred twenty thousand, nine hundred forty-two".