20831740 has 24 divisors (see below), whose sum is σ = 44930592. Its totient is φ = 8107200.

The previous prime is 20831729. The next prime is 20831761. The reversal of 20831740 is 4713802.

It is a super-2 number, since 2×20831740² = 867922782855200, which contains 22 as substring.

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, 13336 + ... + 14815.

It is an arithmetic number, because the mean of its divisors is an integer number (1872108).

Almost surely, 2^20831740 is an apocalyptic number.

20831740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20831740 is an abundant number, since it is smaller than the sum of its proper divisors (24098852).

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

20831740 is a wasteful number, since it uses less digits than its factorization.

20831740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28197 (or 28195 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20831740 is about 4564.1801016174. The cubic root of 20831740 is about 275.1535891347.

The spelling of 20831740 in words is "twenty million, eight hundred thirty-one thousand, seven hundred forty".