20425881 has 8 divisors (see below), whose sum is σ = 31125184. Its totient is φ = 11671920.

The previous prime is 20425879. The next prime is 20425883. The reversal of 20425881 is 18852402.

It is an interprime number because it is at equal distance from previous prime (20425879) and next prime (20425883).

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

It is not a de Polignac number, because 20425881 - 2¹ = 20425879 is a prime.

It is a super-2 number, since 2×20425881² = 834433229252322, which contains 22 as substring.

It is the 4520-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20425883) by changing a digit.

It is a nontrivial repunit in base 4519.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486310 + ... + 486351.

It is an arithmetic number, because the mean of its divisors is an integer number (3890648).

Almost surely, 2^20425881 is an apocalyptic number.

20425881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20425881 is a deficient number, since it is larger than the sum of its proper divisors (10699303).

20425881 is an equidigital number, since it uses as much as digits as its factorization.

20425881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972671.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 20425881 is about 4519.5000829738. The cubic root of 20425881 is about 273.3549435951.

The spelling of 20425881 in words is "twenty million, four hundred twenty-five thousand, eight hundred eighty-one".