20007156 has 48 divisors (see below), whose sum is σ = 50564864. Its totient is φ = 6120576.

The previous prime is 20007149. The next prime is 20007157. The reversal of 20007156 is 65170002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20007157) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 42981 + ... + 43443.

Almost surely, 2^20007156 is an apocalyptic number.

20007156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20007156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25282432).

20007156 is an abundant number, since it is smaller than the sum of its proper divisors (30557708).

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

20007156 is a wasteful number, since it uses less digits than its factorization.

20007156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760 (or 758 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 20007156 is about 4472.9359485689. The cubic root of 20007156 is about 271.4741317532.

Adding to 20007156 its reverse (65170002), we get a palindrome (85177158).

The spelling of 20007156 in words is "twenty million, seven thousand, one hundred fifty-six".