20703951 has 8 divisors (see below), whose sum is σ = 30672560. Its totient is φ = 13802616.

The previous prime is 20703937. The next prime is 20703959. The reversal of 20703951 is 15930702.

It is not a de Polignac number, because 20703951 - 2⁵ = 20703919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 766813 = 20703951 / (2 + 0 + 7 + 0 + 3 + 9 + 5 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20703959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383380 + ... + 383433.

It is an arithmetic number, because the mean of its divisors is an integer number (3834070).

Almost surely, 2^20703951 is an apocalyptic number.

20703951 is a deficient number, since it is larger than the sum of its proper divisors (9968609).

20703951 is an equidigital number, since it uses as much as digits as its factorization.

20703951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766822 (or 766816 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 20703951 is about 4550.1594477556. The cubic root of 20703951 is about 274.5898060840.

The spelling of 20703951 in words is "twenty million, seven hundred three thousand, nine hundred fifty-one".