20157007 has 4 divisors (see below), whose sum is σ = 21707560. Its totient is φ = 18606456.

The previous prime is 20156963. The next prime is 20157029. The reversal of 20157007 is 70075102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70075102 = 2 ⋅35037551.

It is a cyclic number.

It is not a de Polignac number, because 20157007 - 2⁷ = 20156879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20157047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 775257 + ... + 775282.

It is an arithmetic number, because the mean of its divisors is an integer number (5426890).

Almost surely, 2^20157007 is an apocalyptic number.

20157007 is a deficient number, since it is larger than the sum of its proper divisors (1550553).

20157007 is a wasteful number, since it uses less digits than its factorization.

20157007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550552.

The product of its (nonzero) digits is 490, while the sum is 22.

The square root of 20157007 is about 4489.6555547169. The cubic root of 20157007 is about 272.1502152892.

The spelling of 20157007 in words is "twenty million, one hundred fifty-seven thousand, seven".