20425740 has 24 divisors (see below), whose sum is σ = 57192240. Its totient is φ = 5446848.

The previous prime is 20425729. The next prime is 20425759. The reversal of 20425740 is 4752402.

20425740 = 695² + 696² + ... + 734².

It is a self number, because there is not a number n which added to its sum of digits gives 20425740.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170155 + ... + 170274.

It is an arithmetic number, because the mean of its divisors is an integer number (2383010).

Almost surely, 2^20425740 is an apocalyptic number.

20425740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20425740 is an abundant number, since it is smaller than the sum of its proper divisors (36766500).

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

20425740 is a wasteful number, since it uses less digits than its factorization.

20425740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340441 (or 340439 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 20425740 is about 4519.4844838765. The cubic root of 20425740 is about 273.3543146033.

The spelling of 20425740 in words is "twenty million, four hundred twenty-five thousand, seven hundred forty".