20295840 has 48 divisors (see below), whose sum is σ = 63933408. Its totient is φ = 5412096.

The previous prime is 20295839. The next prime is 20295881. The reversal of 20295840 is 4859202.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×20295840² = 823842242611200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20295798 and 20295807.

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, 20662 + ... + 21621.

It is an arithmetic number, because the mean of its divisors is an integer number (1331946).

Almost surely, 2^20295840 is an apocalyptic number.

20295840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20295840 is an abundant number, since it is smaller than the sum of its proper divisors (43637568).

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

20295840 is a wasteful number, since it uses less digits than its factorization.

20295840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42301 (or 42293 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20295840 is about 4505.0904541418. The cubic root of 20295840 is about 272.7736050577.

The spelling of 20295840 in words is "twenty million, two hundred ninety-five thousand, eight hundred forty".