20451982 has 16 divisors (see below), whose sum is σ = 31135104. Its totient is φ = 10075000.

The previous prime is 20451979. The next prime is 20452007. The reversal of 20451982 is 28915402.

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, 65607 + ... + 65917.

It is an arithmetic number, because the mean of its divisors is an integer number (1945944).

Almost surely, 2^20451982 is an apocalyptic number.

20451982 is a deficient number, since it is larger than the sum of its proper divisors (10683122).

20451982 is a wasteful number, since it uses less digits than its factorization.

20451982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 20451982 is about 4522.3867592235. The cubic root of 20451982 is about 273.4713286277.

The spelling of 20451982 in words is "twenty million, four hundred fifty-one thousand, nine hundred eighty-two".