20379731 has 4 divisors (see below), whose sum is σ = 20410512. Its totient is φ = 20348952.

The previous prime is 20379713. The next prime is 20379739. The reversal of 20379731 is 13797302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20379731 - 2¹⁰ = 20378707 is a prime.

It is a super-2 number, since 2×20379731² = 830666871264722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20379739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14375 + ... + 15728.

It is an arithmetic number, because the mean of its divisors is an integer number (5102628).

Almost surely, 2^20379731 is an apocalyptic number.

20379731 is a deficient number, since it is larger than the sum of its proper divisors (30781).

20379731 is an equidigital number, since it uses as much as digits as its factorization.

20379731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30780.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 20379731 is about 4514.3915426113. The cubic root of 20379731 is about 273.1489166830.

The spelling of 20379731 in words is "twenty million, three hundred seventy-nine thousand, seven hundred thirty-one".