20621982 has 16 divisors (see below), whose sum is σ = 42022800. Its totient is φ = 6744192.

The previous prime is 20621981. The next prime is 20621999. The reversal of 20621982 is 28912602.

It is a super-2 number, since 2×20621982² = 850532283216648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20621981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32107 + ... + 32742.

It is an arithmetic number, because the mean of its divisors is an integer number (2626425).

Almost surely, 2^20621982 is an apocalyptic number.

20621982 is an abundant number, since it is smaller than the sum of its proper divisors (21400818).

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

20621982 is a wasteful number, since it uses less digits than its factorization.

20621982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64907.

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

The square root of 20621982 is about 4541.1432481260. The cubic root of 20621982 is about 274.2269506894.

The spelling of 20621982 in words is "twenty million, six hundred twenty-one thousand, nine hundred eighty-two".