20156974 has 8 divisors (see below), whose sum is σ = 30535128. Its totient is φ = 9978600.

The previous prime is 20156963. The next prime is 20157029. The reversal of 20156974 is 47965102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49692 + ... + 50095.

It is an arithmetic number, because the mean of its divisors is an integer number (3816891).

Almost surely, 2^20156974 is an apocalyptic number.

20156974 is a deficient number, since it is larger than the sum of its proper divisors (10378154).

20156974 is a wasteful number, since it uses less digits than its factorization.

20156974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99890.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20156974 is about 4489.6518796005. The cubic root of 20156974 is about 272.1500667724.

It can be divided in two parts, 201 and 56974, that added together give a palindrome (57175).

The spelling of 20156974 in words is "twenty million, one hundred fifty-six thousand, nine hundred seventy-four".