20155940 has 24 divisors (see below), whose sum is σ = 48374592. Its totient is φ = 6910560.

The previous prime is 20155913. The next prime is 20155951. The reversal of 20155940 is 4955102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71846 + ... + 72125.

It is an arithmetic number, because the mean of its divisors is an integer number (2015608).

Almost surely, 2^20155940 is an apocalyptic number.

20155940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20155940 is an abundant number, since it is smaller than the sum of its proper divisors (28218652).

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

20155940 is a wasteful number, since it uses less digits than its factorization.

20155940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143987 (or 143985 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 20155940 is about 4489.5367244294. The cubic root of 20155940 is about 272.1454131642.

The spelling of 20155940 in words is "twenty million, one hundred fifty-five thousand, nine hundred forty".